Wheels from Pontiac Solstice on Jeep Commander: compatible?

No, the centre bore is too small

Same 5x110 PCD, but the centre bore of the wheels from Pontiac Solstice (65.1 mm) is smaller than the hub of Jeep Commander (71.6 mm): they will not fit without being re-bored by a professional.

Pontiac Solstice2005–2009Jeep Commander2006–2010
PCD5x1105x127 / 5x110
Centre bore65.1 mm71.6 mm
ThreadM12x1.50Ecrous - 1/2 - 20 UN
Original wheels ≈7.5Jx18 ET45 R
≈7.5Jx18 ET40

≈: 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 Jeep Commander (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 Jeep Commander on Pontiac Solstice?