With some of the larger tire and wheel combinations, the tire's sidewall can contact the head of the rearward IRS subframe-mounting bolt. Increased clearance for larger tires can be had with these low-profile bolts. At .350" tall, this low-profile bolt head and washer is 30% shorter than the .500" height of the factory bolt head. Even if there is some slight contact with the tire's sidewall, the nicely rounded head of this bolt will not damage the sidewall as readily as the sharp-cornered factory bolt head