Special Performance Package w/ rear drum brakes

Years 1979, 1982 Models 2

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Also described as Special performance package, rear drum brakes

Documented applications

Firebird / Trans Am

1979 Confirmed

Trans Am

Firebird — Third generation (1982–1992)

1982 Single-source

Wikipedia: WS6 with rear drum brakes, for a shortage of rear disc parts; Firebird years: Wikipedia 1982

This page aggregates every documented appearance of WS7 in the Pontiac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.