FM is totally different from AM. Your best bet is to use the case and put a new radio in. I got a chrome cover from a 1950 Coronet that fits perfectly on my 1949 3-window business coupe (ebay $10). If you're using 6 volts, you're out of luck since FM wasn't invented until after 6 volts was obsolete (1970's I think).
[This message has been edited by DodgeFlat6 (edited 01-06-2003).]
