RPOARCHIVE
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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.

    GMC · 1983-1991

    Sierra — Square body (1983–1991)

    sierra

    118 option rows 118 RPO codes 7 model years
    95% Factory-verified
    • ✓ Factory-verified · 112
    • ● Confirmed · 0
    • ◑ Single-source · 6
    • ⚠ Disputed · 0

    Applicable options

    Documented RPO codes

    Have a VIN? Decode it at DecodeThis
    Model year
    Code Option Years Notes & factory source Confidence
    Engines
    L03 Engine, 5.0L V8, electronic fuel injection 1987
    shared platform code; cited from the square-body C/K pickup kits; the 1987 power team pages list the 5.0 liter (305 cu in) V8 with electronic fuel injection; the kit pages also print LO3
    GM Heritage factory kit — 1987 Chevrolet Truck, p.37.
    		Factory-verified
    L05 Engine, 5.7L V8, electronic fuel injection 1987, 1988
    shared platform code; cited from the square-body C/K pickup kits; the 1987 power team pages list the 5.7 liter (350 cu in) V8 with electronic fuel injection; the kit pages also print LO5; 1988 from the 1988 engine data page, which names the R/V 20 bonus and crew cab and R/V 30 pickups
    GM Heritage factory kit — 1987 Chevrolet Truck, p.37.
    GM Heritage factory kit — 1988 Chevrolet Truck, p.41.
    		Factory-verified
    L19 Engine, 7.4L V8, electronic fuel injection 1987, 1988
    shared platform code; cited from the square-body C/K pickup kits; the 1987 power team pages list the 7.4 liter (454 cu in) V8 with electronic fuel injection; 1988 from the 1988 engine data page, which names the R/V 20 bonus and crew cab and R/V 30 pickups
    GM Heritage factory kit — 1987 Chevrolet Truck, p.39.
    GM Heritage factory kit — 1988 Chevrolet Truck, p.54.
    		Factory-verified
    L25 Engine, 4.8L L6, 1 barrel 1983–1986
    shared platform code; cited from the square-body C/K pickup kits; the option pages list the 4.8 liter (292 cu in) 1 barrel L6 for heavy chassis and 30 series trucks; 1987 is left out: its value-features page calls the 4.8L L6 discontinued while the February 1987 power team page still lists it
    GM Heritage factory kit — 1983 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.23.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.23.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.166.
    		Factory-verified
    LB1 Engine, 4.3L V6, 4 barrel 1985, 1986
    shared platform code; cited from the square-body C/K pickup kits; the 1986 option page lists the 4.3 liter (262 cu in) 4 barrel V6
    GM Heritage factory kit — 1985 Chevrolet Truck, p.23.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.20.
    		Factory-verified
    LB4 Engine, 4.3L V6, electronic fuel injection 1987
    shared platform code; cited from the square-body C/K pickup kits; the 1987 option page lists the 4.3 liter (262 cu in) V6 with electronic fuel injection
    GM Heritage factory kit — 1987 Chevrolet Truck, p.51.
    		Factory-verified
    LE3 Engine, 4.1L L6, 2 barrel 1983, 1984
    shared platform code; cited from the square-body C/K pickup kits; the 1984 option page lists the 4.1 liter (250 cu in) 2 barrel L6
    GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.21.
    		Factory-verified
    LE8 Engine, 7.4L V8, 4 barrel 1983–1986
    shared platform code; cited from the square-body C/K pickup kits; the option pages list the 7.4 liter (454 cu in) 4 barrel V8
    GM Heritage factory kit — 1983 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.23.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.23.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.22.
    		Factory-verified
    LE9 Engine, 5.0L V8, 4 barrel 1983–1986
    shared platform code; cited from the square-body C/K pickup kits; the option pages list the 5.0 liter (305 cu in) 4 barrel V8; the 1987 value-features page names the 5.0L EFI engine LE9 while the 1987 power team and option pages print L03, so 1987 is left to L03
    GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.20.
    		Factory-verified
    LF3 Engine, 5.0L V8, 4 barrel, California 1984–1986
    shared platform code; cited from the square-body C/K pickup kits; the 1984 option page offers it on 2WD 10 series only with YF5 California emissions and the MX0 automatic
    GM Heritage factory kit — 1984 Chevrolet Truck, p.37.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.92.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.64.
    		Factory-verified
    LH6 Engine, diesel, 6.2L V8 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; light duty emissions version of the 6.2 liter (379 cu in) diesel; requires B3J diesel equipment
    GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.37.
    		Factory-verified
    LL4 Engine, diesel, 6.2L V8, heavy duty 1983–1988
    shared platform code; cited from the square-body C/K pickup kits; heavy duty emissions version of the 6.2 liter diesel; requires B3J diesel equipment; 1988 from the 1988 engine data page, which names the R/V 20 bonus and crew cab and R/V 30 pickups
    GM Heritage factory kit — 1983 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.23.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.23.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.22.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.39.
    GM Heritage factory kit — 1988 Chevrolet Truck, p.50.
    		Factory-verified
    LS9 Engine, 5.7L V8, 4 barrel 1984–1986
    shared platform code; cited from the square-body C/K pickup kits; the option pages list the 5.7 liter (350 cu in) 4 barrel V8
    GM Heritage factory kit — 1984 Chevrolet Truck, p.22.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.22.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.21.
    		Factory-verified
    LT9 Engine, 5.7L V8, 4 barrel, heavy duty 1983–1986
    shared platform code; cited from the square-body C/K pickup kits; the option pages offer this 5.7 liter (350 cu in) 4 barrel V8 with the heavy duty chassis (C6P), the 20 series bonus and crew cab and 30 series
    GM Heritage factory kit — 1983 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.25.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.25.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.22.
    		Factory-verified
    Transmissions
    MM3 Transmission, manual, 3 speed 1983–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.22.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.37.
    		Factory-verified
    MM4 Transmission, manual, 4 speed 1983–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.23.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.37.
    		Factory-verified
    MM7 Transmission, manual, 4 speed, overdrive 1983–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.22.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.37.
    		Factory-verified
    MX0 Transmission, 4 speed automatic, overdrive 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; the kit pages also print MXO
    GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.22.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.37.
    		Factory-verified
    MX1 Transmission, 3 speed automatic 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; the kit pages also print MXI
    GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.23.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.37.
    		Factory-verified
    Axles
    G80 Axle, rear, locking differential 1984–1986
    shared platform code; cited from the square-body C/K pickup kits; the kits print it as the locking differential; the 1983 and 1987 kits print G80 only in power team footnotes that mark teams not available with it, so those years are left out; the kit pages also print G8O
    GM Heritage factory kit — 1984 Chevrolet Truck, p.38.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.37.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.165.
    		Factory-verified
    GQ1 Axle, rear, standard, non-locking 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; the power team charts print it in nearly every team; the meaning comes from 73-87.com, which reads it as the standard (non-Positraction) rear axle
    GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.37.
    		Single-source
    GT4 Axle, rear, 3.73 ratio 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; power team charts only
    GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.37.
    		Factory-verified
    GT5 Axle, rear, 4.10 ratio 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; power team charts only
    GM Heritage factory kit — 1983 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.23.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.23.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.22.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.39.
    		Factory-verified
    GU2 Axle, rear, 2.73 ratio 1983, 1984
    shared platform code; cited from the square-body C/K pickup kits; power team charts only
    GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.21.
    		Factory-verified
    GU4 Axle, rear, 3.08 ratio 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; power team charts only
    GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.37.
    		Factory-verified
    GU6 Axle, rear, 3.42 ratio 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; power team charts only
    GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.37.
    		Factory-verified
    HC4 Axle, rear, 4.56 ratio 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; power team charts only
    GM Heritage factory kit — 1983 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.23.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.23.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.22.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.39.
    		Factory-verified
    Packages & Trims
    V22 Appearance package, deluxe front 1984–1987
    shared platform code; cited from the square-body C/K pickup kits; the 1987 page names dual rectangular headlamps and a grille with a body color center bar; included with YE9
    GM Heritage factory kit — 1984 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.42.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.160.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.56.
    		Factory-verified
    YE9 Decor package, Sierra Classic 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; the kits print it as the Silverado/Sierra Classic model option, Sierra Classic being the GMC name (the Chevrolet C/K doc reads it as the Silverado decor package)
    GM Heritage factory kit — 1983 Chevrolet Truck, p.28.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.54.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.52.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.150.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.68.
    		Factory-verified
    YG3 Molding package, deluxe 1984–1987
    shared platform code; cited from the square-body C/K pickup kits; fleetside only; included with YE9
    GM Heritage factory kit — 1984 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.44.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.59.
    		Factory-verified
    YJ6 Value decor package 1985–1987
    shared platform code; cited from the square-body C/K pickup kits; solid paint with body striping and a black painted grille; not on bonus cab, crew cab or stepside; 10 series includes N67 rally wheels; 1984 is left out because the 1984 kit prints YJ6 only in a weight-table line and in the rally wheels entry
    GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.159.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.82.
    		Factory-verified
    Z62 Decor package, High Sierra 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; the kits print it as the Scottsdale/High Sierra model option, High Sierra being the GMC name (the Chevrolet C/K doc reads it as the Scottsdale decor package)
    GM Heritage factory kit — 1983 Chevrolet Truck, p.27.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.53.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.51.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.151.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.67.
    		Factory-verified
    ZQ2 Operating convenience package 1984–1987
    shared platform code; cited from the square-body C/K pickup kits; includes AU3 power door locks and A31 power windows
    GM Heritage factory kit — 1984 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.44.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.59.
    		Factory-verified
    Equipment
    A01 Glass, tinted, all windows 1984–1987
    shared platform code; cited from the square-body C/K pickup kits; 1984–1986 rest on the sliding rear window entry, whose note states what the window gets when A01 tinted glass is ordered with it (a companion remark); the kit pages also print AO1
    GM Heritage factory kit — 1984 Chevrolet Truck, p.48.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.155.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.58.
    		Factory-verified
    A28 Window, rear, sliding 1984–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1984 Chevrolet Truck, p.48.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.155.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.61.
    		Factory-verified
    A31 Window, power 1984, 1987
    shared platform code; cited from the square-body C/K pickup kits; 1985 and 1986 are left out: those pickup pages name A31 only in the operating convenience package contents
    GM Heritage factory kit — 1984 Chevrolet Truck, p.48.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.61.
    		Factory-verified
    AS3 Body, crew cab 1983–1987, 1991
    shared platform code; cited from the square-body C/K pickup kits; the kits print it with E63 as the crew cab body ordering code; GM later used AS3 for a rear seat on other trucks; 1991 from the 1991 truck-camper page, which prints the R/V 3500 bonus and crew cab models (R/V30943); 1991 rests on the Chevrolet-only truck books, so the row is single-source
    GM Heritage factory kit — 1983 Chevrolet Truck, p.4.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.34.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.33.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.169.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.48.
    GM Heritage factory kit — 1991 Chevrolet Truck, p.64.
    		Single-source
    AU3 Locks, power door 1985, 1987
    shared platform code; cited from the square-body C/K pickup kits; 1984 and 1986 are left out: those pickup pages name AU3 only in the operating convenience package contents
    GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.58.
    		Factory-verified
    B32 Floor mats, front, color-keyed 1984, 1987
    shared platform code; cited from the square-body C/K pickup kits; the 1985 (p.43) and 1986 (p.159) kit pages print the code as 832, which is not an accepted reading, so those years are left out
    GM Heritage factory kit — 1984 Chevrolet Truck, p.45.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.58.
    		Factory-verified
    B3J Equipment, diesel 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; required with the LH6 and LL4 diesels
    GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.33.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.33.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.155.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.48.
    		Factory-verified
    B84 Moldings, body side, black 1986
    shared platform code; cited from the square-body C/K pickup kits; fleetside only; 1984, 1985 and 1987 are left out: those pages name B84 only in package contents or exclusions, and the 1985 option line prints 384
    GM Heritage factory kit — 1986 Chevrolet Truck, p.158.
    		Factory-verified
    B85 Moldings, body side, bright 1985
    shared platform code; cited from the square-body C/K pickup kits; fleetside only; 1984, 1986 and 1987 are left out: those pages name B85 only in other options’ contents and exclusions
    GM Heritage factory kit — 1985 Chevrolet Truck, p.44.
    		Factory-verified
    B93 Guards, door edge 1986
    shared platform code; cited from the square-body C/K pickup kits; the 1984 kit page (p.46) prints the code as 893, which is not an accepted reading, so 1984 is left out
    GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
    		Factory-verified
    C42 Heater, front, heavy duty 1985–1987
    shared platform code; cited from the square-body C/K pickup kits; not with C60 air conditioning
    GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.158.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.58.
    		Factory-verified
    C60 Air conditioning, All-Weather 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; 1983, 1985 and 1987 rest on a power team requirement remark (with the MX1 automatic and C60 air conditioning, KC4 is required); the kit pages also print C6O
    GM Heritage factory kit — 1983 Chevrolet Truck, p.18.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.26.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.159.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.43.
    		Factory-verified
    C6P Chassis, heavy duty 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; 20 series heavy duty chassis; 1983 and 1987 from the body ordering codes, 1984–1986 from other options’ availability and price lines that name it
    GM Heritage factory kit — 1983 Chevrolet Truck, p.4.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.37.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.36.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.169.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.49.
    		Factory-verified
    C91 Lamp, dome 1985–1986
    shared platform code; cited from the square-body C/K pickup kits; 1984 is left out: its page names C91 only in the YE9 package contents (the 1984 dome lamp line prints ca1); 1987 is left out: its pages name C91 only in package contents, and its dome lamp line prints c91
    GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.158.
    		Factory-verified
    CD4 Wipers, windshield, intermittent 1984–1987
    shared platform code; cited from the square-body C/K pickup kits; not with the 3 speed manual (MM3)
    GM Heritage factory kit — 1984 Chevrolet Truck, p.48.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.155.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.61.
    		Factory-verified
    D44 Mirror, outside, below eye line, painted 1986
    shared platform code; cited from the square-body C/K pickup kits; 9 x 6.5 inch, left-hand and right-hand
    GM Heritage factory kit — 1986 Chevrolet Truck, p.158.
    		Factory-verified
    D45 Mirror, outside, below eye line, stainless steel 1986
    shared platform code; cited from the square-body C/K pickup kits; 9 x 6.5 inch, left-hand and right-hand
    GM Heritage factory kit — 1986 Chevrolet Truck, p.158.
    		Factory-verified
    D73 Rails, pickup box side 1984–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1984 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.44.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.59.
    		Factory-verified
    DF2 Mirror, outside, left-hand and right-hand, camper style, stainless steel 1984, 1986, 1987
    shared platform code; cited from the square-body C/K pickup kits; 7.5 x 10.5 inch head on adjustable arms
    GM Heritage factory kit — 1984 Chevrolet Truck, p.45.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.158.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.58.
    		Factory-verified
    DG5 Mirror, outside, senior West Coast type, painted 1984, 1986, 1987
    shared platform code; cited from the square-body C/K pickup kits; only in: 30 series; shipped loose for dealer installation
    GM Heritage factory kit — 1984 Chevrolet Truck, p.45.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.158.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.58.
    		Factory-verified
    E62 Body equipment, stepside pickup box 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; printed as the Stepside/Fenderside body ordering code
    GM Heritage factory kit — 1983 Chevrolet Truck, p.4.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.33.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.33.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.169.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.48.
    		Factory-verified
    E63 Body equipment, fleetside pickup box 1983–1987, 1991
    shared platform code; cited from the square-body C/K pickup kits; printed as the Fleetside/Wideside body ordering code; 1991 from the 1991 truck-camper page, which prints the R/V 3500 bonus and crew cab models (R/V30943); 1991 rests on the Chevrolet-only truck books, so the row is single-source
    GM Heritage factory kit — 1983 Chevrolet Truck, p.4.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.33.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.33.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.169.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.48.
    GM Heritage factory kit — 1991 Chevrolet Truck, p.64.
    		Single-source
    F51 Shock absorbers, front and rear, heavy duty 1984–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1984 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.44.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.59.
    		Factory-verified
    F58 Stabilizer bar, front, heavy duty 1984–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1984 Chevrolet Truck, p.47.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.45.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.156.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.60.
    		Factory-verified
    F59 Stabilizer bar, front 1984–1987
    shared platform code; cited from the square-body C/K pickup kits; printed in the stabilizer bar block of the option pages; the meaning comes from 73-87.com
    GM Heritage factory kit — 1984 Chevrolet Truck, p.47.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.45.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.156.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.60.
    		Single-source
    F60 Spring, front, heavy duty 1984–1987
    shared platform code; cited from the square-body C/K pickup kits; the kit pages also print F6O
    GM Heritage factory kit — 1984 Chevrolet Truck, p.47.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.45.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.156.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.60.
    		Factory-verified
    G50 Spring, rear, heavy duty 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; 1983 from the GVWR chart; the kit pages also print G5O
    GM Heritage factory kit — 1983 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.47.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.45.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.156.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.60.
    		Factory-verified
    G51 Spring, rear, extra capacity 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; 1983 from the GVWR chart
    GM Heritage factory kit — 1983 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.47.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.45.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.156.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.60.
    		Factory-verified
    G60 Spring, rear, main and auxiliary 1984–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1984 Chevrolet Truck, p.47.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.45.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.156.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.60.
    		Factory-verified
    J50 Brakes, power 1984, 1986, 1987
    shared platform code; cited from the square-body C/K pickup kits; 1984 and 1987 from other options’ requirement remarks (available only with J50 or J55 power brakes)
    GM Heritage factory kit — 1984 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.160.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.59.
    		Factory-verified
    J55 Brakes, power, heavy duty 1984–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1984 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.42.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.160.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.57.
    		Factory-verified
    K05 Heater, engine block 1985–1987
    shared platform code; cited from the square-body C/K pickup kits; 600 watt, 120 volt; included with V10; the kit pages also print KO5
    GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.158.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.58.
    		Factory-verified
    K22 Generator, 94 amp 1986
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1986 Chevrolet Truck, p.159.
    		Factory-verified
    K34 Speed control, electronic 1986, 1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.59.
    		Factory-verified
    K46 Air cleaner, pre-cleaner 1985–1987
    shared platform code; cited from the square-body C/K pickup kits; not with the L25 4.8L
    GM Heritage factory kit — 1985 Chevrolet Truck, p.42.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.160.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.56.
    		Factory-verified
    K81 Generator, 66 amp 1984–1986
    shared platform code; cited from the square-body C/K pickup kits; 1983 is left out: its page names K81 only in the B3J diesel equipment package contents
    GM Heritage factory kit — 1984 Chevrolet Truck, p.45.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.159.
    		Factory-verified
    KC4 Cooling system, engine oil 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; the kits print it as the engine oil cooler; 1987 from the air conditioning entry’s requirement remark
    GM Heritage factory kit — 1983 Chevrolet Truck, p.18.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.26.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.159.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.56.
    		Factory-verified
    N33 Steering wheel, Comfortilt 1984–1987
    shared platform code; cited from the square-body C/K pickup kits; not with the 3 speed manual (MM3)
    GM Heritage factory kit — 1984 Chevrolet Truck, p.47.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.45.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.156.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.60.
    		Factory-verified
    N41 Steering, power 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; 1983 from a power team requirement remark
    GM Heritage factory kit — 1983 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.47.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.45.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.156.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.60.
    		Factory-verified
    N51 Steering, power, not desired 1984–1987
    shared platform code; cited from the square-body C/K pickup kits; no-charge delete of power steering
    GM Heritage factory kit — 1984 Chevrolet Truck, p.47.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.45.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.156.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.60.
    		Factory-verified
    N67 Wheels, rally 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; only in: 10 series; special hub caps and trim rings; every year rests on tire entries’ requirement remarks (requires N67 or PA6 wheels), as no option line prints a legible N67
    GM Heritage factory kit — 1983 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.27.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.27.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.162.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.54.
    		Factory-verified
    N90 Wheels, aluminum, cast 1985–1987
    shared platform code; cited from the square-body C/K pickup kits; only in: 10 series; four 15 x 7 wheels; the kit pages also print N9O
    GM Heritage factory kit — 1985 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.155.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.61.
    		Factory-verified
    NL2 Fuel tank, auxiliary 1984–1987
    shared platform code; cited from the square-body C/K pickup kits; right-hand frame mounted
    GM Heritage factory kit — 1984 Chevrolet Truck, p.47.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.156.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.60.
    		Factory-verified
    NY7 Shield, transfer case 1984–1987
    shared platform code; cited from the square-body C/K pickup kits; only in: 4WD
    GM Heritage factory kit — 1984 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.44.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.59.
    		Factory-verified
    P01 Wheel covers, bright metal 1984–1987
    shared platform code; cited from the square-body C/K pickup kits; the kit pages also print PO1
    GM Heritage factory kit — 1984 Chevrolet Truck, p.48.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.155.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.60.
    		Factory-verified
    P13 Carrier, spare tire, side mounted 1987
    shared platform code; cited from the square-body C/K pickup kits; fleetside only; printed in the spare carrier block of the 1987 option page; the meaning comes from 73-87.com
    GM Heritage factory kit — 1987 Chevrolet Truck, p.57.
    		Single-source
    PA1 Wheel covers, special 1984–1987
    shared platform code; cited from the square-body C/K pickup kits; the kit pages also print PAI
    GM Heritage factory kit — 1984 Chevrolet Truck, p.48.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.155.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.62.
    		Factory-verified
    PA6 Wheels, styled 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; only in: 10 series; special hub caps; every year rests on tire entries’ requirement remarks (requires N67 or PA6 wheels), as no option line prints a legible PA6
    GM Heritage factory kit — 1983 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.27.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.27.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.162.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.54.
    		Factory-verified
    PF2 Wheels, aluminum, forged 1987
    shared platform code; cited from the square-body C/K pickup kits; only in: 10 series; four 15 x 7 wheels
    GM Heritage factory kit — 1987 Chevrolet Truck, p.61.
    		Factory-verified
    R04 Wheel, single rear 1984–1987
    shared platform code; cited from the square-body C/K pickup kits; only in: 30 series fleetside; the kit pages also print RO4
    GM Heritage factory kit — 1984 Chevrolet Truck, p.48.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.155.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.63.
    		Factory-verified
    R05 Wheel, dual rear 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; only in: 30 series fleetside; 1983 from the GVWR chart; the kit pages also print RO5
    GM Heritage factory kit — 1983 Chevrolet Truck, p.22.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.48.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.155.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.63.
    		Factory-verified
    TP2 Battery, auxiliary 1984, 1986, 1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1984 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.160.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.56.
    		Factory-verified
    TT5 Headlamps, halogen high beam 1985–1987
    shared platform code; cited from the square-body C/K pickup kits; the 1984 kit page (p.45) prints the code as TTS, which is not an accepted reading, so 1984 is left out
    GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.158.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.58.
    		Factory-verified
    U01 Lamp, roof marker, five 1985–1987
    shared platform code; cited from the square-body C/K pickup kits; included with R05 dual rear wheels; 1984 is left out: the 1984 page names U01 only in another option’s contents and its option line prints UDI; the kit pages also print UO1
    GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.158.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.58.
    		Factory-verified
    U35 Clock, electric, quartz 1983, 1984, 1986, 1987
    shared platform code; cited from the square-body C/K pickup kits; 1983 and 1986 from the instrument cluster feature pages, which name the optional electric clock (RPO U35)
    GM Heritage factory kit — 1983 Chevrolet Truck, p.33.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.44.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.145.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.57.
    		Factory-verified
    U37 Lighter, cigarette 1984–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1984 Chevrolet Truck, p.45.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.44.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.158.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.58.
    		Factory-verified
    U58 Radio, AM/FM stereo 1984–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1984 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.44.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.59.
    		Factory-verified
    U63 Radio, AM 1984–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1984 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.44.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.59.
    		Factory-verified
    U69 Radio, AM/FM 1984–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1984 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.44.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.59.
    		Factory-verified
    U76 Antenna, windshield 1984–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1984 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.44.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.59.
    		Factory-verified
    UA1 Battery, heavy duty 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; 1985 from the power team requirement remarks (requires N41 and UA1); the 1984 page prints the battery line as UAI
    GM Heritage factory kit — 1983 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.23.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.160.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.56.
    		Factory-verified
    UM6 Radio, AM/FM stereo, electronically tuned, seek and scan, cassette tape, digital clock 1986, 1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.59.
    		Factory-verified
    UN3 Radio, AM/FM stereo, cassette tape 1984–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1984 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.44.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.59.
    		Factory-verified
    V01 Radiator, heavy duty 1984–1987
    shared platform code; cited from the square-body C/K pickup kits; the kit pages also print VO1, VOI
    GM Heritage factory kit — 1984 Chevrolet Truck, p.44.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.159.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.57.
    		Factory-verified
    V02 Radiator and transmission oil cooler, heavy duty 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; automatic transmissions only; 1983 from a power team requirement remark; the kit pages also print VO2
    GM Heritage factory kit — 1983 Chevrolet Truck, p.18.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.44.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.159.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.57.
    		Factory-verified
    V10 Package, cold climate 1984, 1986, 1987
    shared platform code; cited from the square-body C/K pickup kits; includes special insulation, a special heater and defroster, K05 engine block heater and UA1 heavy duty battery; 1985 is left out: its pages name V10 only in other options’ inclusion remarks
    GM Heritage factory kit — 1984 Chevrolet Truck, p.44.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.159.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.57.
    		Factory-verified
    V31 Guards, front bumper, chromed 1984–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1984 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.42.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.160.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.57.
    		Factory-verified
    V42 Bumper, rear step, chromed 1984–1986
    shared platform code; cited from the square-body C/K pickup kits; printed in the chromed bumper block of the option pages
    GM Heritage factory kit — 1984 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.42.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.160.
    		Factory-verified
    V43 Bumper, rear step, painted 1984–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1984 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.42.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.160.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.57.
    		Factory-verified
    V76 Tow hooks, front 1984–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1984 Chevrolet Truck, p.48.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.46.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.155.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.60.
    		Factory-verified
    VF1 Bumper, rear, chromed 1984–1986
    shared platform code; cited from the square-body C/K pickup kits; printed in the chromed bumper block of the option pages
    GM Heritage factory kit — 1984 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.42.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.160.
    		Factory-verified
    YG4 Body, bonus cab 1983–1987, 1991
    shared platform code; cited from the square-body C/K pickup kits; the kits print it with E63 as the bonus cab body ordering code; GM later used YG4 for "seats, optional, not desired" on other trucks; 1991 from the 1991 truck-camper page, which prints the R/V 3500 bonus and crew cab models (R/V30943); 1991 rests on the Chevrolet-only truck books, so the row is single-source
    GM Heritage factory kit — 1983 Chevrolet Truck, p.4.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.4.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.33.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.169.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.48.
    GM Heritage factory kit — 1991 Chevrolet Truck, p.64.
    		Single-source
    Z53 Gages, voltmeter, temperature and oil pressure 1983, 1985–1987
    shared platform code; cited from the square-body C/K pickup kits; 1983 from the instrument cluster feature page; 1984 is left out: its standalone gauges line prints 253 and the code otherwise appears only in package contents
    GM Heritage factory kit — 1983 Chevrolet Truck, p.33.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.159.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.58.
    		Factory-verified
    Z75 Shock absorbers, front, quad 1986
    shared platform code; cited from the square-body C/K pickup kits; only in: 4WD 10 and 20 series regular cab; includes heavy duty rear shocks and a front axle bumper; the 1984, 1985 and 1987 pages name Z75 only in spring and stabilizer price lines, which do not date a year
    GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
    		Factory-verified
    Z81 Camper special chassis equipment 1984–1986
    shared platform code; cited from the square-body C/K pickup kits; includes camper body wiring harness; 1984 and 1985 from the GVWR chart line for camper special chassis equipment; 1987 is left out: its pages name Z81 only in other options’ exclusions and contents
    GM Heritage factory kit — 1984 Chevrolet Truck, p.29.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.29.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.160.
    		Factory-verified
    Paint
    ZY1 Color combination, solid 1983–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1983 Chevrolet Truck, p.37.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.36.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.61.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.167.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.50.
    		Factory-verified
    ZY2 Color combination, conventional two-tone 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; 1983 from the color chart heading; 1984 and 1985 from the paint application pages
    GM Heritage factory kit — 1983 Chevrolet Truck, p.37.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.64.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.63.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.167.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.50.
    		Factory-verified
    ZY3 Color combination, special two-tone 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; fleetside only; 1983 and 1985 from the color chart headings
    GM Heritage factory kit — 1983 Chevrolet Truck, p.37.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.36.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.61.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.167.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.51.
    		Factory-verified
    ZY4 Color combination, deluxe two-tone 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; fleetside only
    GM Heritage factory kit — 1983 Chevrolet Truck, p.39.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.36.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.35.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.167.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.51.
    		Factory-verified
    ZY5 Color combination, exterior decor package, two-tone with striping 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; fleetside only; dual-tone body side and rear decal striping; not with R05 dual rear wheels
    GM Heritage factory kit — 1983 Chevrolet Truck, p.39.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.37.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.35.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.167.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.51.
    		Factory-verified
    ZY6 Color combination, custom two-tone 1985, 1987
    shared platform code; cited from the square-body C/K pickup kits; 1985 from the color chart heading; 1987 from the color chart, which marks colors for ZY2 and ZY6 only
    GM Heritage factory kit — 1985 Chevrolet Truck, p.61.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.77.
    		Factory-verified
    ZY9 Color combination, special two-tone, Big Dooley 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; only in: 30 series fleetside with R05 dual rear wheels
    GM Heritage factory kit — 1983 Chevrolet Truck, p.37.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.35.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.34.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.167.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.51.
    		Factory-verified
    Internal / Process
    NA5 internal Emission system, federal 1983–1987
    shared platform code; cited from the square-body C/K pickup kits; 1983, 1984, 1986 and 1987 from the power team blocks headed with NA5 standard emissions; 1985 from the roof marker lamp requirement remark
    GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.43.
    		Factory-verified
    NA6 internal Emission system, high altitude 1984–1987
    shared platform code; cited from the square-body C/K pickup kits; 1984 and 1985 from the power team blocks headed with NA6 high altitude emissions; 1987 from the roof marker lamp requirement remark (the 1987 option line prints NAG)
    GM Heritage factory kit — 1984 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.21.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.166.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.58.
    		Factory-verified
    YF5 internal Emission system, California 1983–1987
    shared platform code; cited from the square-body C/K pickup kits
    GM Heritage factory kit — 1983 Chevrolet Truck, p.14.
    GM Heritage factory kit — 1984 Chevrolet Truck, p.37.
    GM Heritage factory kit — 1985 Chevrolet Truck, p.36.
    GM Heritage factory kit — 1986 Chevrolet Truck, p.166.
    GM Heritage factory kit — 1987 Chevrolet Truck, p.51.
    		Factory-verified

    Source document: gmc/sierra-squarebody.md. Rows marked — record an option the factory offered whose RPO code is not documented in the consulted sources.