There is a post on this in the "restoration" section. Do a search for it. Someone showed pictures of how he modified his front bumper brackets. It was as easy as drilling out one hole. The rear is a little more difficult. Either buy 70-71 rear bumper brackets or you have to cut and weld the existing brackets to work. Also check out the "member projects" section. There are some great pics of bumpers that have been moved in. Personally I like the look of the rubber bumpers. What I'm going to do is move the bumpers in next to the body, but keep the rubber extensions.