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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    ES1 Factory-verified

    Chevrolet · Regular Production Option

    Quiet Sound Group (acoustic insulation)

    Years 1978 Models 1 Factory citations 1

    Documented applications

    Vega / Monza
    • 1978 Factory-verified
      GM Heritage factory kit — 1978 Chevrolet Monza, p.66.

    This page aggregates every documented appearance of ES1 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.