Depending on the rim size and brand of tire you'll need more than just the rounded IRS bolts for 335's to fit. You'll need at least a 5/8 inch hub centric spacer and extended reach lug-nuts or one of those 1 inch spacers with the built in lugs. You may even need to roll the fender lip.Just wondering, will 335's fit my 03 cobra? I have heard both ways... I got the rounded head IRS bolts that are supposed to give you that little bit of added clearence, but don't know if it'll help or not. Thanks