Cadillac Option Codes 1960–1982 — Division Index

Cadillac's option documentation differs from Chevrolet's in two important ways, and both affect how these tables should be read:

1. Two code schemes. Through the 1960s Cadillac identified options by short accessory order codes (single letters, letter+digit, or digits — e.g. C Cruise Control, K Air Conditioner, 1–4 radios). Only "body" options appear on the body (cowl) plate. Starting in 1969 Cadillac paperwork began pairing each order code with a corporate GM RPO production code (e.g. K30 Cruise Control, C61 Climate Control), and during the 1970s the production RPO became the code stamped/printed on plates and build sheets. Tables below carry both where sources give both; the Scheme is noted per year section in the model docs. Order-letter assignments were reshuffled almost every year — the RPO is the stable key from 1969 on; the letter is not.
2. Thinner enthusiast coverage. There is no Cadillac equivalent of the Chevrolet RPO registries. The backbone source here is the Cadillac & LaSalle Club (RRR region) Color, Upholstery & Accessory Database 1940–1979; it ends at 1979. Cross-checking comes from Automotive Mileposts (1967–1979, full-line/Eldorado/Seville pages), the 63/64 Cadillac body-plate decode, ht4100.com (1979–85 Eldorado), and Wikipedia (engine RPOs). GM Heritage Center info kits (1960–1974 Cadillac) exist as free PDFs but are image scans without OCR text — they were downloaded and checked but could not be machine-read; they remain the best lead for anyone hand-verifying a code.

Coverage honesty

Model documents

Because most Cadillac options were line-wide (offered on every series, with per-series standard/optional differences), the complete per-year tables are kept in deville-calais.md; the Eldorado, Fleetwood, and Seville docs list model-specific codes and exceptions and point back for the line-wide sets.

Master code table (most-referenced codes)

RPO-era production codes (stable 1969–1979; letters shown are examples from within the span and varied by year). Confidence per the division methodology: confirmed = 2+ independent sources, single-source, disputed.

Division sources

Backbone (fetched and extracted in full):

• Cadillac & LaSalle Club (RRR Region), "The Cadillac Color, Upholstery & Accessory Database 1940–1979" — https://rrrclc.org/wp-content/uploads/2014/05/CLC-Color-Database-2017-03-20.pdf (per-year excerpts also at e.g. https://rrrclc.org/wp-content/uploads/2014/05/19761.pdf, 19771.pdf, 19781.pdf). Order codes 1960–1979; RPO production codes from 1969.

Cross-checks:

• Automotive Mileposts (via web.archive.org; live site blocks bots): full-line pages http://automotivemileposts.com/cadillac/cadi1967optionalequipment.html (and …1969…, …1970…, …1972…, …1973…, …1974…, …1975…, …1976…); Eldorado pages http://automotivemileposts.com/eldorado/eldo1971optionalequipment.html (and …1975…, …1977…, …1978…); Seville pages http://automotivemileposts.com/cadillac/seville/seville1976optionalequipment.html (and …1977…, …1978…, …1979…). Prices, sales codes, RPOs.
• 63/64 Cadillac Website — "Body Name Plate — decoded" — https://6364cadillac.ning.com/profiles/blogs/body-name-plate (1963–64 accessory codes from the cowl plate).
• ht4100.com — Options & Specifications — https://www.ht4100.com/options.html (1979–1985 Eldorado engine VIN/RPO codes, CF8, D60).
• Wikipedia — Cadillac Seville / Cadillac Eldorado — https://en.wikipedia.org/wiki/Cadillac_Seville, https://en.wikipedia.org/wiki/Cadillac_Eldorado (engine RPOs L49, LF9, L61, L62, LC4, LT8).

Leads / context (checked, not machine-readable or narrative only):

• GM Heritage Center vehicle information kits — https://www.gm.com/heritage/archive/vehicle-information-kits; Cadillac per-year PDFs at https://www.gm.com/content/dam/company/no_search/heritage-archive-docs/vehicle-information-kits/cadillac/<YEAR>_Cadillac_VVI.pdf (1960–1974 verified to download; image scans, no text layer).
• The (New) Cadillac Database (Yann Saunders / CLC) — https://www.newcadillacdatabase.org/ (narrative option/price mentions, no code tables; see …/static/CDB/Dbas_txt/Cad66-75.htm).
• Cadillac & LaSalle Club vehicle authentication — https://cadillaclasalleclub.org/vehicle_authentication/ (build-record ordering for 1903–1970 cars).
• 1960 Cadillac Optional Specifications Manual (scan) — https://www.xr793.com/wp-content/uploads/2021/12/1960-Cadillac-Optional-Specs-Manual.pdf.
• Cadillac forums RPO threads (paywalled/blocked to bots at fetch time): https://www.cadillacforums.com/threads/rpo-codes.1108816/, https://caddyinfo.ipbhost.com/topic/21604-rpo-codes/.