If you want to test, buy a set of 10.5"s for rear first, and try them up front. If they work, which I doubt, you can get another setfor rears. If theyDON'T fit, no loss, just go with 9"supthere and get the 10.5"s widened to 11" or more, like I am going to do. Hoping topossiblygo 325's or even 335's. I think that is a little ambitious, but I will do some figurin' out back and see.315's are no problem whatever
Jazzer