Volvo Repair: volvo 242 cassette radio.., replacement belts, volvo 242

Question
Ok so here is the deal, I wanted the original cassette radio for my 77 Volvo 242. It originally came with an 8 track deck, but the original owner put a cd player in. I bought a genuine cassette radio from circa 79. With its age, the belts are worn  so all cassettes seem slower than they should be. I know that I can only use genuine replacement belts but I can't find them anywhere. I can replace the belts myself I just need to know where to find them..please help

Answer
Thomas, You are the first person that ever asked me this one, and to be quite honest, I have no idea.  Volvo will only sell the radio, if they can even get it anymore.  The only place that I can think of would be an electronics shop.  Other than that, I have no clue.  Roger