Whew..... I decided to make a change. My 05 GTO (red one) has had a Wilwood big brake kit for 10 years. My 06 GTO (Orange one) I put together a Brembo kit using calipers from CTSV and a bracket kit. Well, that kit was designed to clear "factory" 18" wheels. I have the Australian optional CV8Z wheel on the car, and although the wheel barrel clears the calipers, the wheel spoke does not clear the caliper face. So, in a rush to make it to a show I had a company make me some custom hub/wheel eccentric spacers and of course I had to install longer wheel studs.
Fast forward...... So, I decided to do some test fitting. I pulled two left wheels off the red car, two left wheels off the orange car and swapped the wheels between the cars and yep, without wheel spacers, the wheels from the orange car clear the wilwood brakes on the red car. So, yep. I removed the entire wilwood brake kit. Took the custom red powder coated calipers to powder coat and had them done (black face first) apply a Monaro decal then powder coat silver, remove Monaro decal to reveal the black script then clear coated. Removed the entire CTSV brake kit from the orange car, and I'm almost done installing the wilwood kit on the orange car (including cutting off all 10 wheel studs) Now I have the CTSV calipers at powder coat getting the silver stripped and redone in red with white GTO lettering (same two color method) I'll then install that kit on the red car.
All to prevent running spacers! oh, btw yes the spacers did make the tires scrub when you hit a hard bump at highway speeds. So they needed to go.