M7 / M8 ● Confirmed

Buick · Regular Production Option

Rear defroster / block heater

Years 1970 Models 1

Documented applications

Skylark / GS →

• 1970 ● Confirmed

  All intermediates

This page aggregates every documented appearance of M7 / M8 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.