Thanks Tom. It's a 65 12 6 943 449 tuner out of a 2005 X5. The tuner's not currently installed in the car, I have the install planned for Friday/Sat, but wanted all the pieces in hand to have a smooth install. It looks like it might be produced in the 38th week of 2004 (KW: 38/04).

To recap, the cable that you linked to eliminates the ability to have a CD changer, but enables the use of a Sirius tuner? Or it enables you to keep the CD changer and simply use the 6 pin analog connector for Sirius -- even though there's no 6 pin connector in the trunk?