ahhhhh actually its all wrong these guys at that shop , cant do anything right. they keep on giving me wrong sizes , this is the 3rd time they screwed me.because they are lazy to help me out. i will find a new shop on monday to do this . but the right size is at least 225/45/18s in back and front also. but if it does not fit in front then , 225/40/18s in the front.maybe even larger in back if possible. i will let you know in the beginning of next week. its just so much space in between i know that i can fit something really big in there.