M7 / M8 / M9 ● Confirmed

Buick · Regular Production Option

Rear defroster / block heater / heated-glass defroster

Years 1970 Models 1

Documented applications

Full-Size — LeSabre / Electra / Wildcat →

• 1970 ● Confirmed

  Full-size

This page aggregates every documented appearance of M7 / M8 / M9 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.