Not every Sirius module will work. Do you have navigation, because that affects the compatible modules. Also, some of the earlier modules have dual antenna inputs, which means you would need an antenna splitter, if your car is pre-wired with a single antenna lead.

These are the parts that would work:
65.12-0 416 377 The newest module; comes with 1 yr Sirius subscription when purchased new
65.12-0 398 140 I believe this is identical to the -377 module, but it did not have a Sirius subscription when new
84.11-0 153 365 Only compatible with navigation-equipped cars, and it has the dual antenna inputs
84.11-0 141 981 Only compatible with non-navigation cars, and it has dual antenna inputs

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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