I believe your radio supports the optional Aux input. You could install the Aux input pretty inexpensively and easily. You would not have the integrated control, but the sound would be perfect.

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SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input