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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    Z6A Factory-verified

    Chevrolet · Regular Production Option

    Defogger system, rear window and outside rearview mirrors

    Years 1984–89, 2016–19, 2023, 2025–27 Models 3 Factory citations 14
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    Also described as Gooseneck and fifth wheel prep packageGooseneck / 5th Wheel Prep Package

    Also documented for GMC

    Documented applications

    Corvette — C4 (1984–1996)
    • 1984–1989 Factory-verified

      heated rear window and mirrors; coupe only (1988 options page p.43)

      GM Heritage factory kit — 1984 Chevrolet Corvette, p.20.
      GM Heritage factory kit — 1985 Chevrolet Corvette, p.43.
      GM Heritage factory kit — 1986 Chevrolet Corvette, p.50.
      GM Heritage factory kit — 1987 Chevrolet Corvette, p.10.
      GM Heritage factory kit — 1988 Chevrolet Corvette, p.34.
      GM Heritage factory kit — 1989 Chevrolet Corvette, p.22.
    Silverado HD — K2XX (2015–2019)
    Silverado HD (T1XX, 2020–2027)

    This page aggregates every documented appearance of Z6A in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.