Window, rear quarter, swing out

Years 1983–89, 1998–00 Models 4 Factory citations 14

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Also described as Windows, swing-out quarter

Also documented for Buick Cadillac Chevrolet Oldsmobile Pontiac Saturn

Documented applications

Sierra — GMT400 (1988–2000)

1998–2000 Factory-verified

GM factory document — 1998 gmc gmc c pickup 2wd rpo code list, p.1.
GM factory document — 1999 gmc gmc c pickup 2wd rpo code list, p.1.
GM factory document — 2000 gmc gmc c pickup 2wd rpo code list, p.1.

Sonoma — first generation (1982–1993)

1983–1989 Factory-verified

the 1984, 1988 pages print A2O; only in: extended cab; shared S-series code; cited from the joint S-10/S-15 pages of the S-10 kits

GM Heritage factory kit — 1983 Chevrolet S 10, p.28.
GM Heritage factory kit — 1984 Chevrolet S 10, p.21.
GM Heritage factory kit — 1985 Chevrolet S 10, p.27.
GM Heritage factory kit — 1986 Chevrolet S 10, p.18.
GM Heritage factory kit — 1987 Chevrolet S 10, p.25.
GM Heritage factory kit — 1988 Chevrolet S 10, p.36.
GM Heritage factory kit — 1989 Chevrolet S 10, p.25.

Suburban — GMT400 (1992–1999)

1998–1999 Factory-verified

GM factory document — 1998 gmc gmc suburban 2wd rpo code list, p.1.
GM factory document — 1999 gmc gmc suburban 2wd rpo code list, p.1.

Yukon — GMT400 (1992–1999)

1998–1999 Factory-verified

GM factory document — 1998 gmc yukon 2wd rpo code list, p.1.
GM factory document — 1999 gmc yukon 2wd rpo code list, p.1.

This page aggregates every documented appearance of A20 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.