I bought one for $300 or so last year off ebay from some company I cant remember and they refunded my money since they couldn't produce one.

Seems they are getting rare.

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
More are at my website

Aftermarket E53 Radio Install