U1 / U2 / U3 ● Confirmed

Buick · Regular Production Option

Convenience groups (by series)

Years 1970 Models 1

Documented applications

Skylark / GS →

• 1970 ● Confirmed

  Skylark & GS / 350 & Sportwagon / Custom & GS 455

This page aggregates every documented appearance of U1 / U2 / U3 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.