John's right that radios were installed at the dealers or distributors. IIRC, they put a Becker stereo cassette deck in mine (even though I can't find it listed on my invoice so maybe they gave it to me!). I think that over the years, I've heard about others who also had Becker radios but I don't know how common they really were. As John suggests, you can also go the extra mile and find an old ad that mentions the radio and look for one of those and you can get vintage style radios with modern electronics.