Hey hey, firedriver, I am not sure, and I had the same problem when doing my 37. Front vs rear etc. What I did want to say is there is a place somewhere in Ohio called Bill's Speed Shop that advertises NEW bumpers 1947-1972 for $105 "up", plus shipping,in the Old Cars Weekly Newspaper. I just read it a few minutes ago. I have not called, or know anything about this place, but perhaps someone else has, or someone from that area can tell us. I figure they will be as good as the ones I got from I&I Reproductions! I have the phone # if ever interested to call. Oh, I love that Camaro!!