WARNING: This page is about a different car, the 2010 BMW X3, 2009 BMW X3, 2008 BMW X3, and 2007 BMW X3. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Servodrive
Courtesy of BMW OF NORTH AMERICA, INC.
Installation:
If necessary, align shaft of flap(s) to be actuated to position of servodrive to be installed.