- 1986–1988 Factory-verified
four high back bucket seats, two front and two midship; 1986 from the 1986 pages in the kit file named for the prior model year; shared M-body code; cited from the joint Astro/Safari pages of the Astro kits.
GM Heritage factory kit — 1985 Chevrolet Astro Van, p.29.GM Heritage factory kit — 1987 Chevrolet Astro Van, p.28.GM Heritage factory kit — 1988 Chevrolet Astro Van, p.8.
ZP4 Factory-verified
Also documented for BuickChevroletSaturn
Documented applications
This page aggregates every documented appearance of ZP4 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.