H6 ● Confirmed

Buick · Regular Production Option

Rallye Ride Control Package: HD wheels, rear stabilizer bar, firm-ride shocks/springs, boxed lower control arms

Years 1970 Models 1

Documented applications

Skylark / GS →

• 1970 ● Confirmed

  GS, GS 455; included in GSX

This page aggregates every documented appearance of H6 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.