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

    Cadillac · Regular Production Option

    Rear radio control

    Years 1966–68 Models 1 Factory citations 1

    Documented applications

    DeVille / Calais
    • 1966 Factory-verified

      Series 75 only; kit "AM Rear Control"

      GM Heritage factory kit — 1966 Cadillac VVI, p.71.
    • 1967–68 Confirmed

      Series 75 only

    This page aggregates every documented appearance of 4 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.