WARNING: This page is about a different car, the 2005 BMW 645Ci and 2004 BMW 645Ci. However, it is still accessible from the selected car via links, so may be relevant.
Following parts must not be damaged:
(1) Bump stop
Fig 1: Identifying Bump Stop
Courtesy of BMW OF NORTH AMERICA, INC.
Adjust bump stop (1) to correct height by turning left or right.