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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    P13 Single-source

    GMC · Regular Production Option

    Carrier, spare tire, side mounted

    Years 1987 Models 1 Factory citations 1
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    Also documented for Chevrolet

    Documented applications

    Sierra — Square body (1983–1991)
    • 1987 Single-source

      shared platform code; cited from the square-body C/K pickup kits; fleetside only; printed in the spare carrier block of the 1987 option page; the meaning comes from 73-87.com

      GM Heritage factory kit — 1987 Chevrolet Truck, p.57.

    This page aggregates every documented appearance of P13 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.