Chrysler AM/FM 3501623 Radio

I sent a Chrsyler AM/FM 3501623 Radio to be repaired.

The repair service has replied that AM and FM is working but... "the [AM/FM] linkage that throws the switch is broke and missing. This part is unique to these 72-76 A body AM FM radios . It was made of pot metal and they often broke. I do not have one on hand, and the only way to get one is to pay for another am fm radio to rob that part".

Is it possible to find this part or does anyone know of a replacement part source or should I just forget it and just be happy the FM works?