The pinouts on both types of radios are the same.
If you have DSP, then the car only has front channel stereo audio feeds from the radio to the amp.
The part number I posted are for the round pin with pigtails.
Here is a post that details a Sirius retrofit. It includes the harnesses: Updated Sirius Retrofit Parts List

__________________
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