Buick · 1961-1982
Skylark / GS
skylark · special · gran sport · gs · gs 340 · gs 350 · gs 400 · gs 455
64 option rows 58 RPO codes 11 model years
0% Factory-verified
- ✓ Factory-verified · 0
- ● Confirmed · 58
- ◑ Single-source · 6
- ⚠ Disputed · 0
Applicable options
Documented RPO codes
Model year
| Code | Option | Years | Notes & factory source | Confidence |
|---|---|---|---|---|
| — (Gran Sport option) | Mid-year Gran Sport package: 401 cid "nailhead" V8 (marketed as 400), 325 hp, HD chassis/convertible-boxed frame, dual exhaust | 1965 | Skylark; 15,000+ sold first year; period ordering code not located in online sources | Confirmed confirmed (package) |
| — (Gran Sport / GS 400) | GS became its own series for 1966; 1967 introduced new 400 cid V8 (GS 400) and junior GS 340 | 1966–1967 | Ordering codes for these years not located online — gap | Confirmed confirmed (models) |
| A1 | Stage 1 Special Package (dealer ordering code): hotter cam, 11.0:1 compression, larger valves/stiffer springs, rejetted Quadrajet, recurved distributor, functional cool-air induction, 3.64 posi axle, recalibrated TH-400 (higher shift points) | 1969 | GS 400 only; 1,256 coupes + 212 convertibles, all Flint-built; engine code **RS** | Confirmed single-source (code) / confirmed (package) |
| — (Stage 2) | Dealer-installed Stage 2 package: radical cam, high-compression forged pistons, headers, intake and carb changes; parts could ship in the trunk | 1969 | GS 400; drag-race oriented, very few built | Confirmed |
| — (Cool Air induction) | Functional dual hood-scoop ram air, standard on GS 400 | 1969 | GS 400 / Stage 1 | Confirmed |
| A1 | Stage 1 Performance Option: 455 "Stage 1" 360 hp, low-restriction dual exhaust, performance axle w/ positive traction, specific ornamentation, H.D. radiator | 1970 | GS 455 only; $113.75–$115 over GS 455; engine code **SS** | Confirmed |
| A9 | GSX package (mid-year): front & rear spoilers, hood-mounted tachometer, hood/side stripes, Rallye Ride Control (H6), power front disc brakes, 4-speed, G60x15 billboard tires on 7-in wheels, Rallye steering wheel & instrumentation, black bucket-seat interior (trim 188), 3.64 posi | 1970 | GS 455 only; $1,196 pkg; 678 built (491 Apollo White code 10, 187 Saturn Yellow code Q); 400 w/ Stage 1 | Confirmed |
| A3 | 350 cid 2-bbl V8 (Skylark 350 requirement) | 1970 | Skylark | Confirmed |
| A7 | High Performance 350 cid 4-bbl V8, regular fuel | 1970 | Skylark, Skylark 350/Custom, Sportwagon | Confirmed |
| A8 | High Performance Group: 350-4bbl + dual exhaust | 1970 | Skylark/Custom/Sportwagon (std. on GS) | Confirmed |
| B2 | Turbo Hydra-Matic 400 (RPO M40) | 1970 | GS 455 | Confirmed |
| B3 | 4-speed manual floor shift (RPO M20/M21) | 1970 | GS, GS 455 | Confirmed |
| B4 | Full-length console (auto + buckets req.) | 1970 | Skylark Custom, GS, GS 455 | Confirmed |
| B5 | Turbo Hydra-Matic 350 | 1970 | Skylark/350/Custom, Sportwagon, GS | Confirmed |
| B7 | Consolette (manual floor shift + buckets req.) | 1970 | GS, GS 455 | Confirmed |
| B8 | Short non-shift floor console | 1970 | Skylark Custom, GS, GS 455 | Confirmed |
| B9 | 3-speed manual floor shift | 1970 | GS | Confirmed |
| C1 / C6 / C7 | Power disc brakes / power steering / power brakes | 1970 | All intermediates | Confirmed |
| D1 / D5 / D6 / D0 | Sonomatic AM / AM-FM / rear speaker / stereo tape | 1970 | All intermediates | Confirmed |
| E5 | Evaporative emission system (Calif. req.) | 1970 | All intermediates | Confirmed |
| E9 | Space Saver spare | 1970 | Skylark, GS, GS 455 | Confirmed |
| F1 / F2 | Whitewall / oversize whitewall H78-14 tires | 1970 | All / Skylark & GS | Confirmed |
| F8 | Wide Oval red line tires G70-14 | 1970 | GS, GS 455 | Confirmed |
| F9 | Wide Oval white billboard-lettered tires G70-14 | 1970 | GS, GS 455 | Confirmed |
| G1 | Performance axle with positive traction | 1970 | All intermediates | Confirmed |
| G4 | Positive traction differential (RPO G80) | 1970 | All intermediates | Confirmed |
| G5 | Economy axle (with A7/A8 + B5 only) | 1970 | Skylark, Sportwagon | Confirmed |
| H1 | Trailer towing option | 1970 | Skylark, Sportwagon, GS | Confirmed |
| H2 | Ride & Handling option | 1970 | Skylark/350/Custom | Confirmed |
| H5 | Heavy-duty Energizer (battery) | 1970 | Skylark, Sportwagon, GS | Confirmed |
| H6 | Rallye Ride Control Package: HD wheels, rear stabilizer bar, firm-ride shocks/springs, boxed lower control arms | 1970 | GS, GS 455; included in GSX | Confirmed |
| I-2 | Comfort-Flo forced ventilation | 1970 | Various body styles | Confirmed |
| I-6 | Air conditioner, manual controls | 1970 | All intermediates | Confirmed |
| I-7 | Heavy-duty cooling (extra-HD radiator, thermo fan drive, 55A Delcotron; N.A. with A1) | 1970 | All intermediates | Confirmed |
| J1 / J3 / J5 | Custom belt packages | 1970 | All intermediates | Confirmed |
| K3 | Speed alert | 1970 | All intermediates | Confirmed |
| K4 | Depressed-park wipers | 1970 | Skylark, Sportwagons | Confirmed |
| L1 / L2 | Soft-Ray tinted glass / windshield | 1970 | All intermediates | Confirmed |
| M7 / M8 | Rear defroster / block heater | 1970 | All intermediates | Confirmed |
| N3 | Heavy-duty air cleaner | 1970 | All intermediates | Confirmed |
| O4 / O5 / O7 | Door guards / remote mirror / protection group | 1970 | All / Sportwagon | Confirmed |
| P1 / P2 | Carpet savers & handy mats / carpet savers | 1970 | All intermediates | Confirmed |
| Q5 / Q6 | 4-way power seat / custom padded cushions | 1970 | Various | Confirmed |
| R1 | Power windows | 1970 | Skylark 350 up, GS, GS 455 | Confirmed |
| S6 / S7 | Cruise Master / tilt wheel | 1970 | All intermediates | Confirmed |
| T2 | Electric door locks | 1970 | All intermediates | Confirmed |
| U1 / U2 / U3 | Convenience groups (by series) | 1970 | Skylark & GS / 350 & Sportwagon / Custom & GS 455 | Confirmed |
| U5 | Instrument group (gauges + tachometer) | 1970 | GS/GS 455 | Confirmed |
| U9 | Instrument gauges and Rallye clock | 1970 | GS, GS 455 | Confirmed |
| U6 / U8 | Electric clock / gauges + clock | 1970 | Various | Confirmed |
| V1 / V2 / V3 / V7 | Deluxe covers / chrome wheels / wire covers / Super Sport wheels | 1970 | All; V3 GS only | Confirmed |
| W2 / W4 / W5 / W6 | Molding packages | 1970 | Various | Confirmed |
| X1 / X2 / X3 | Deluxe / Rallye / rim-blower steering wheels | 1970 | Various | Confirmed |
| X7 | Front & rear carpeting | 1970 | Skylark | Confirmed |
| — (Stage 1) | Stage 1 455 continued (engine code **TS** '71, **WS** '72); compression reduced; posi standard, 3.42 axle (code `LWB` '71, `LW` '72) | 1971–1972 | GS 455; coupes built Flint/Framingham/Fremont, convertibles Flint only | Confirmed |
| V (VIN) | 5th VIN character `V` identifies factory Stage 1 455 engine | 1972 | GS Stage 1 | Confirmed |
| — (GSX) | GSX appearance package continued in reduced form, more colors | 1971–1972 | GS; production far below 1970 | Single-source |
| B97 | Spoiler (corporate RPO) | 1970–1972 | GS/GSX era A-body | Single-source |
| D88 / D90 / D98 | Stripe groups (corporate RPO) | 1970–1976 | A-body | Single-source |
| M20 / M21 / M15 | 4-spd wide / 4-spd close / 3-spd manual (RPO) | 1970–1972 | GS | Confirmed |
| M38 / M40 | THM-350 / THM-400 (RPO) | 1970–1972 | Skylark / GS 455 | Confirmed |
| G80 / G88 / G91 / G92 / G95 | Posi / performance axle / perf. axle w/ posi / perf. ratio / economy axle (RPO) | 1970–1976 | A-body | Single-source |
| N42 | Rim-blower steering wheel (RPO) | 1970–1972 | GS | Single-source |
| NK3 | Sport steering wheel, soft rim (RPO) | 1971–1976 | A/X-body | Single-source |
Source document: buick/skylark-gs.md. Rows marked — record an option the factory offered whose RPO code is not documented in the consulted sources.