cool, and im not really sure that the sirius retrofit link you posted works for the e53 does it? from what I understand I need:

Sirius module
Extension Cable
Cd Changer adapter cable
Antenna
Retrofit kit
Do you have the PN's for the cables and antenna and retrofit kit?

I have looked under real oem for my x and it doesnt even show a retrofit kit for the sirius, or any parts for sirius at all, am I looking in the wrong place?