I put on new track bar and then bored out the bushing on it to put in a tighter fitting bolt. The stock one I dont know the diameter, but it seemed to have too much slop in it when it was in the bushing. So I used a 7/8 drill bit to ream the opening to recieve a 7/8 bolt. It seemed to remove all of the slop in the bolt/bushing area. so far so good.