I bought a set of used 66 mounts last night to put in place of the 65 style mounts in my 66 coupe and I cannot get the mounts to line up and get the bolts through the holes. Is this normal or should the pieces fit slide right in like the 65 mounts? The holes on the second angle piece fit pefectly but when I tried to put the other piece on it would not wrap around the frame completely, the radius of the bracket kept hitting the radius of the frame. I tried swapping the pieces side to side but had the same problem. Am I missing something?