Speaker system, 8, quad front door-mounted, shelf quad, amplifier

Years 1999–04 Models 2 Factory citations 12

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Also documented for Cadillac Chevrolet Oldsmobile Pontiac

Documented applications

Century — W-body (1997–2005)

1999–2004 Factory-verified

twin list is word for word the Regal's; may be Regal equipment

GM factory document — 1999 buick century rpo code list, p.1.
GM factory document — 2000 buick century rpo code list, p.1.
GM factory document — 2001 buick century rpo code list, p.1.
GM factory document — 2002 buick century rpo code list, p.1.
GM factory document — 2003 buick century rpo code list, p.1.
GM factory document — 2004 buick century rpo code list, p.1.

Regal — W-body (1997–2004)

1999–2004 Factory-verified

Wikipedia lists an 8-speaker sound system for the Regal

GM factory document — 1999 buick regal rpo code list, p.1.
GM factory document — 2000 buick regal rpo code list, p.1.
GM factory document — 2001 buick regal rpo code list, p.1.
GM factory document — 2002 buick regal rpo code list, p.1.
GM factory document — 2003 buick regal rpo code list, p.1.
GM factory document — 2004 buick regal rpo code list, p.1.

This page aggregates every documented appearance of U85 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.