I had to use these on the front of my 60 so the wheel weights wouldn't smack the TREs. They are 1/4" and come with special lugs that have a thinner, deeper shoulder that SHOULD be able to pass through the hole in the wheel. Well, mine didn't, they were slightly too big, so I had to drill the holes in my wheels to 5/8" as I recall. After that, it worked well. I drilled ALL my wheels so they can all go on the front, including the spare. In the end, I put a Chevy axle in the back that uses slightly larger wheel studds and my wheels arlready fit it.