I have a pair of 14 X 8.5" at a friends in L.A.. Already polished, brand unknown but could have him look. They are designed for a snap/push in center cap and not the screw on type. Not sure what your Shelby Cal 500's have. Also have a pair of 14 x 7's with bolt on center cap but one has a deep mark on it's face. Can send pics via a PM if interested.