UM1 / UM2 / U63 / U69 / U76 / U79 / U80 ✓ Factory-verified

Chevrolet · Regular Production Option

Radio/tape/antenna/speaker options

Years 1970–72 Models 1 Factory citations 2

Documented applications

Monte Carlo →

• 1970–1972 ✓ Factory-verified

  shared A-body electricals

  ⛭ GM Heritage factory kit — 1970 Chevrolet Monte Carlo, p.55.

  ⛭ GM Heritage factory kit — 1972 Chevrolet Monte Carlo, p.28.

This page aggregates every documented appearance of UM1 / UM2 / U63 / U69 / U76 / U79 / U80 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.