Wheels from Opel Insignia OPC on Chevrolet Camaro: compatible?

No, the centre bore is too small

Same 5x120 PCD, but the centre bore of the wheels from Opel Insignia OPC (67.1 mm) is smaller than the hub of Chevrolet Camaro (70.3 mm): they will not fit without being re-bored by a professional.

Opel Insignia OPC2008–2017Chevrolet Camaro1969–1982
PCD5x1205x120.65 / 5x120
Centre bore67.1 mm70.3 mm
ThreadEcrous - 14x1.50Ecrous - 12x1.50
Original wheels 8Jx18 ET41 R
R
R
R
≈7.5Jx18 ET32

≈: 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 Chevrolet Camaro (Ecrous - 12x1.50), 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 Chevrolet Camaro on Opel Insignia OPC?