In 1956, the State of California issued EVERY car in the state new plates (yellow/black lettering). They did the same thing in 1963 (black/yellow lettering). IMHO, keep your black plates and get them restored. And you avoid extra YOM fees. Old registration --> the DMV will only let you assign black plates outside of YOM (and not the new Legacy ones) only if you can prove those plates were originally on that car (or truck). This will tie the plate to the VIN. The only way to do this is a pink slip or old registration.