Q, to aid your search, add your year, model, existing audio system [or codes from your build sheet if you have it] to your signature. Looking back through the thread, you appear to have an early [2001; what build date?] with a basic radio set up. The more info you provide, the better for posters here to help you.

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2006 X5 3.0 6-spd w/Evo UUC ssk
sport/premium pkgs
born Valentine's Day, 2006.