Check this out:
http://www.etk.cc/bmw/DE/parts/info/...0425/appliance
Select your car and you will get a list of all parts that are needed.
If I select the F31 the following parts are necessary.
Navigation Unit: 65902410420 --> Europe!
Navigation Unit holder & controller high: 65902410425 (until 06/2013)
Cable harness: 65902410426
As you can see you will get the navi unit holder only together with the controller.
Please check these numbers with your dealer!
BR
Radair
Btw: I have the Combox, but I don't think that is somehow relevant.