If I were you, I would just call them or email them directly. Go to their web site, click on the "Contact us" button, and that gives you an email form and a phone number.

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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