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.

    Division

    Buick

    4 documented model pages · 189 option rows.

    Buick — chrome detail

    Models

    1960s Buick full-size luxury sedan
    Full-Size — LeSabre / Electra / Wildcat 1960-1982 · 71 rows
    1970s Buick Regal colonnade coupe
    Regal / Century 1973-1982 · 30 rows
    1960s Buick Riviera personal-luxury coupe
    Riviera 1963-1982 · 24 rows
    1960s Buick Skylark GS muscle coupe
    Skylark / GS 1961-1982 · 64 rows

    Division reference

    Buick — Option Code Reference (1960–1982)

    Division index for Buick Motor Division option codes, covering Skylark / Gran Sport / GSX, Riviera, Special, the full-size line (LeSabre, Wildcat, Electra), Regal, Century, and Apollo.

    Model documents

    Document Models covered Years
    skylark-gs.md Special, Skylark, GS 340/350/400/455, Gran Sport, GSX, Apollo 1961–1982
    riviera.md Riviera (incl. Gran Sport, boattail, S Type) 1963–1982
    fullsize.md LeSabre, Wildcat, Electra 225, Estate Wagon, Centurion 1960–1982
    regal-century.md Century (Colonnade & downsized), Regal, Regal Sport Coupe (turbo), 1982 Grand National 1973–1982

    Buick's two numbering systems (important)

    Sources for classic Buicks show two distinct code systems, and they are frequently confused:

    1. Buick dealer ordering / accessory codes — short letter+digit codes (A1, A9, B4, H6, I-6, …) printed on Buick's own dealer order forms and option sheets through roughly 1972. These are Buick-internal, are reused with different meanings on different car lines in the same year (e.g. in 1970, A9 = Riviera GS option on the full-size sheet, while A9 = GSX package on the intermediate/GS line, and A1 = Stage 1 on the GS 455), and also change meaning year-to-year.
    2. GM corporate RPO codes — three-character codes (G80, M21, LC8, WE2, …) used on build sheets / production broadcast copies, and used exclusively on window stickers and order forms from the mid-1970s onward. These are consistent corporate-wide within a year.

    A decoded vehicle's trunk-lid service label or build sheet shows RPO codes; period Buick sales literature and many enthusiast writeups quote the dealer ordering codes. Both are tabulated in the model docs, with the system noted where sources distinguish them.

    Master code table (headline codes)

    Code Description Years Models/Notes Confidence
    A1 Stage 1 performance option (dealer ordering code) — 455 "Stage 1" engine, low-restriction dual exhaust, performance axle w/ posi, H.D. radiator, ornamentation 1969–1970 GS 400 (1969), GS 455 (1970); 1970 verified on factory option sheet, 1969 usage single-source confirmed (1970) / single-source (1969)
    A9 GSX package (dealer ordering code) — spoilers, hood tach, stripes, Rallye suspension, bucket interior 1970 GS 455 only; Saturn Yellow or Apollo White confirmed
    A9 Riviera Gran Sport option (dealer ordering code) 1965–1970 Riviera; $306.38 in 1965 confirmed
    A8 Super Wildcat 425 dual-quad engine option (1965 Riviera) / High Performance Group 350-4bbl (1970 intermediates) 1965 / 1970 Meaning differs by year/line confirmed
    Y48 Super Wildcat 425 dual 4-bbl V8, 360 hp 1964 Riviera single-source
    H6 Rallye Ride Control Package (dealer ordering code) 1970 GS, GS 455; included in GSX confirmed
    G80 Positive traction (limited-slip) differential — corporate RPO 1970–1982 All lines confirmed
    KF2 Wheel spin control ("Max Trac") — corporate RPO 1971–1974 Riviera and full-size single-source (mapping)
    M20 / M21 Muncie 4-speed manual, wide / close ratio — corporate RPO 1970–1974 GS, Century GS confirmed
    M40 Turbo Hydra-Matic 400 — corporate RPO (dealer code B2) 1970–1976 GS 455, full-size, Riviera confirmed
    L72 455 CID 2-bbl V8 — corporate RPO (Buick usage) 1971–1976 Full-size single-source
    LD5 3.8L (231) V6 2-bbl — corporate RPO 1977–1982 Regal, Century, LeSabre, Skylark confirmed
    LC8 3.8L V6 Turbocharged, 4-bbl 1978–1980 Regal Sport Coupe, LeSabre Sport Coupe, Century Turbo Coupe, Riviera S Type single-source
    Y47 Turbo Regal performance package — dual exhaust (resonator) system, higher-stall converter, 3.08 axle mid-1981–1982 Regal Sport Coupe single-source
    Y44 Sport Coupe Decor Package — Designers' Accent paint, blackout trim 1982 Regal Sport Coupe single-source
    N78 Cast aluminum wheels 1982 Regal single-source
    WE2 Grand National package (215 built) 1982 Regal; code later reused 1984–87 confirmed
    B97 Spoiler — corporate RPO 1970–1976 GS/GSX-era A-body single-source
    V (VIN 5th char) Stage 1 455 engine identification in VIN (not an option code) 1972–1974 GS Stage 1, Century GS Stage 1 confirmed

    Coverage gaps

    • 1960–1964 full-size and Special/Skylark ordering codes: no reliable online code tables located; only narrative sources. Codes for these years are largely undocumented here.
    • 1965–1969 year-by-year dealer code sheets: only the 1970 sheets (intermediate + full-size) are transcribed online at TeamBuick; 1965–69 and 1971–72 sheets were not found in machine-readable form.
    • 1975–1982 Skylark (X-body) and 1979–82 Riviera (E-body): only partial RPO coverage.
    • GM Heritage Center order-guide PDFs for these years were not directly retrievable during compilation and would upgrade many single-source entries.

    Division sources