One or two narrow hip 427 ERA cars have been built. The rear fenders were molded by an outside shop and installed on a standard ERA body by the paint shop. I believe molds were made so more fenders could be cast as demand developed. If you scroll through the threads in the ERA sub- forum you should come across the build thread - he’s a member here. As I understand it, very few 427 cars were actually built without an
oil cooler scoop.