In my '70 the PO had an aftermarket radio cassette. I used to listen to all of my
Led Zeppelin, Aerosmith, Ted Nugent, Deep Purple, Cheap Trick, Van Halen, Krokus, and Black Sabbath
cassettes. When the cassette player stopped working the whole unit came out and I never replaced it. That's when I started to listen to the flowmaster symphonies and never even thought of replacing my radio.