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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    U03 Factory-verified

    Chevrolet · Regular Production Option

    Low "D" note horn

    Years 1963–79 Models 4 Factory citations 6

    Also described as Tri-Volume hornLow HornLow note horn

    Documented applications

    Camaro
    • 1967–1968 Factory-verified

      coupe

      GM Heritage factory kit — 1967 Chevrolet Camaro, p.7.
      GM Heritage factory kit — 1968 Chevrolet Camaro, p.31.
    Chevelle / El Camino
    • 1965–1968 Factory-verified
      GM Heritage factory kit — 1965 Chevrolet Chevelle, p.9.
      GM Heritage factory kit — 1968 Chevrolet El Camino, p.3.
    Nova / Chevy II
    • 1965–1966 Factory-verified
      GM Heritage factory kit — 1965 Chevrolet Nova, p.5.
      GM Heritage factory kit — 1966 Chevrolet Nova, p.6.

    This page aggregates every documented appearance of U03 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.