There is a dealer that is saying the wheels from an 07 Boxster S will not fit on an 03 Boxster. The wheels that are on the 07 came from a Cayman S originally. Everything I'm seeing on the wheel sizes shows all three Offset: 50mm and a Bolt Pattern: 5-130.
I'm not saying the Dealership is lying, but I can't find any information that shows the dealership is right.