As I just learned the hard way, it really depends on the type of wheel on your vehicle. The mfg. indicates that you need 1/8" clearance between the caliper cover and inside of your wheel. I put the covers on a short while ago and then swapped 18 inch Saleen style rims for 18 inch Bullitt style rims without checking the clearance. As soon as I hit the road, I could hear the loud scrapping sound of the wheels against the caliper covers. The fix is an easy install of 5/16" spacers that slip right over wheel studs between the axle and wheel. If H can change a tire, he can install these spacers, otherwise most any tire, repair or body shop will do the job.