IH4 ✓ Factory-verified

Buick · Regular Production Option

Trim, interior design (H4)

Years 1998–99 Models 1 Factory citations 2

Query this via API →

Also documented for Oldsmobile

Documented applications

Riviera — G-body (1995–1999) →

• 1998–1999 ✓ Factory-verified
  ⛭ GM factory document — 1998 buick riviera rpo code list, p.1.

  ⛭ GM factory document — 1999 buick riviera rpo code list, p.1.

This page aggregates every documented appearance of IH4 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.