I took my original AM radios from both of my darts to Retro Radio - Mom and Pop business (for real) that always has a booth at Carlisle. They replaced the internal components with new stuff and so now I have AM/ FM set up for 4 speakers and an RCA jack in the back that I use for a patch cord into a USB, CD Player, whatever. It wasn't cheap but it has worked fine for 5-6 years. If you can't find them, I'll look up their contact info if you are interested. From the front it still looks like the same AM radio.
