51 12 150 Removing and installing/replacing trim on attachment for rear bumper trim (HP)
WARNING: This page is about a different car, the 2003 BMW X5 and 2002 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
This job is described under:
51 12 000 REMOVING AND INSTALLING COMPLETE REAR BUMPER (HP) .