1965 dart radio

That's incorrect. There were AM FM radios before 65. Here's one from a 65 Imperial and I have seen them for the early A bodies too. They pop up from time to time.

http://www.ebay.com/itm/1965-CHRYSL...ERB-/321064210133?vxp=mtr&hash=item4ac0eb0ed5

Well, you are right, however I was considering only A bodies in my reply. I don't think I've seen any in a 65 or earlier Dart or Valiant.
Model 923 was standard AM only ...
:cheers: