I’ve never owned a beaker car, but I see plenty in the salvage yards here in MN, often times loaded with parts. I have brought nice grilles and many other parts for these cars to swap meets and listed on eBay and they don’t seem to sell. But I did sell 2 70 Dart front clips to guys who were turning their Dart Sport into a Demon. I don’t see many on the road in my area either, most I see is at the MoPar show. My friend had a pretty nice 74 Dart Swinger with a built 340, he had a hard time selling it and it was priced to sell. I sold I’d love to drive a nice 4-door one as a daily driver….be fun!