i've put 2 sets on 2 b-bodies (68 coronet and a 69 rr). both times the cars were on my whirly-jig rotisserie. never had any problems with body gaps or anything else. a lot of guys will say that's not the correct way, but as long as you have a good solid unibody and a good rotisserie you won't have any problems.i will add, they were both post cars so that may have helped keep the body in line.the pictures that were on us car tools website are actually of me installing them on a 68 coronet while on it's side on my rotisserie.