FRENES

Wheels from Pontiac Firebird on Cadillac Seville: compatible?

No, the centre bore is too small

Same 5x120.65 PCD, but the centre bore of the wheels from Pontiac Firebird (70.3 mm) is smaller than the hub of Cadillac Seville (78.1 mm): they will not fit without being re-bored by a professional.

Pontiac Firebird1982–1992Cadillac Seville1975–1979
PCD5x120.655x127 / 5x120.65 / 5x115
Centre bore70.3 mm78.1 mm
ThreadEcrous - 12x1.50Ecrous - 1/2 - 20 UN
Original wheels R
≈6.5Jx14 ET12
≈7Jx16 ET45		 ≈6.5Jx14 ET43
≈6.5Jx15 ET10
≈7Jx16 ET51
≈7.5Jx16 ET51

≈: width estimated from the original tyre size.

Before fitting the wheels

An identical hub is not enough: offset, width and diameter change the position of the wheel, and larger calipers can touch a smaller wheel. Original wheels often use bolts or nuts with a specific seat: keep the fixings intended for the wheel, with the thread of Cadillac Seville (Ecrous - 1/2 - 20 UN), tightened to the torque shown on its vehicle page. Finally, check that the size is among the approved fitments for your vehicle. This comparison is for guidance only: have the fitting approved by a professional.

And the other way round: wheels from Cadillac Seville on Pontiac Firebird?