U99 ✓ Factory-verified

Buick · Regular Production Option

Speaker system 9, dual front door two tweeters and two woofers, dual extended range rear doors, dual subwoofer package shelf, center instrument panel, amplifier

Years 1998–05 Models 1 Factory citations 2

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Documented applications

Park Avenue — G-body (1997–2005) →

• 1998–2005 ✓ Factory-verified
  ⛭ GM factory document — 1998 buick park avenue rpo code list, p.1.

  ⛭ GM factory document — 2005 buick park avenue rpo code list, p.1.

This page aggregates every documented appearance of U99 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.