I ordered OER GM Restoration Parts units for my 63 SS and despite claims of 'exact reproductions' and 'manufactured to exact GM specifications.' the fit was not good. When I compared them to my originals, they appeared minutely smaller overall, the flange on the back was wider and the anodized finish was poor. I returned the repops, then pick and filed out all the dents in my originals and had them polished. I'm glad I went this route, because the result was outstanding and the fit and look is far beyond that of the repops. My suggestion is to try and find a decent set of originals to restore.