So. plug is interchangable?? Apparently. Cool.jkersh1 said:I did the opposite when the cassette radio on my '02 went TU and was replaced with a CD radio. The CD radio requires an antenna adapter (#24 on the attached parts fiche) not present with the cassette radio, but I believe you can just chuck it when you install the cassette.
http://www.realoem.com/bmw/showparts.do?model=0555&mospid=51717&btnr=65_1194&hg=65&fg=05
Having said that, have you considered having your radio repaired?