Ok my g/f got this rear bumper off a saleen... Probelm is they didnt leave the mounting brackets on it. So I figure I could take off the old rear bumper ones. Problem is the side rear mounts on the saleen rear have 2 big holes on each side and her bumper those two are pop riveted on and I dont see anywhere for pop rivets... Anyone who knows anything about this chime in please! Thanks!