Wheels, 15 inch diamond-spoke aluminum

Years 1977–81, 1986–88 Models 3

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Also described as Cast aluminum "snowflake" wheelsWheels, aluminum, cast, 15 x 7

Also documented for Cadillac Chevrolet GMC Oldsmobile

Documented applications

Firebird / Trans Am

1977–1981 Single-source

Included w/ WS6

Fiero (1984–1988)

1986–1987 Single-source

years from the OSG wheel page (diamond spoke); the rparts list agrees; the Halderman list's N90 has a 4.75 inch bolt circle, not the Fiero's 100 mm

Firebird — Third generation (1982–1992)

1987–1988 Single-source

Firebird years: 3rdgenformula option pages 1987–1988

This page aggregates every documented appearance of N90 in the Pontiac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.