July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
33 10... Overview of rear differential/output shafts
WARNING: This page is about a different car, the 2009 BMW 550i and 2008 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Overview Of Rear Differential/Output Shafts