Rails, pickup box side

Years 1983–87 Models 3 Factory citations 7

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Also described as Rails, cargo box side

Also documented for Chevrolet

Documented applications

Caballero — G-body (1983–1987)

1983–1984 Factory-verified

The 1985–1987 order guides print 073, so those years are not claimed; shared G-body platform code; cited from the joint El Camino/Caballero pages of the Chevrolet El Camino kits

GM Heritage factory kit — 1983 Chevrolet El Camino, p.6.
GM Heritage factory kit — 1984 Chevrolet El Camino, p.7.

Sierra — Square body (1983–1991)

1984–1987 Factory-verified

shared platform code; cited from the square-body C/K pickup kits

GM Heritage factory kit — 1984 Chevrolet Truck, p.46.
GM Heritage factory kit — 1985 Chevrolet Truck, p.44.
GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
GM Heritage factory kit — 1987 Chevrolet Truck, p.59.

Sonoma — first generation (1982–1993)

1986 Factory-verified

shared S-series code; cited from the joint S-10/S-15 pages of the S-10 kits

GM Heritage factory kit — 1986 Chevrolet S 10, p.17.

This page aggregates every documented appearance of D73 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.