To make mine fit I used a 1" H&R spacer like the one that http://www.stangsuspension.com or http://www.maximummotorsports.com sells...No grinding at all was needed, but they do stick out of the wheel well a little but that's no biggie for me since i only use them for the track...You will have to cut off about 1/2" off the tip of the stock lugs though since they stick through the spacer and won't let the wheel sit flush to the spacer...