I have Stoptech 355mm rotors and ST-40 calipers. (4 piston) I went with custom wheels. The stock wheels require spacers to clear the front calipers .... or I could have ground on the calipers to gain the clearance needed to run without spacers. I imagine the 8 piston calipers need custom wheels or 19" MB wheels. I believe my front Forgestars are ET32.

Les