51 16 ... Removing and installing/replacing armrest on cover on center armrest
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.
Open cover (3).
Lever out covers (1) and release screws underneath.
Detach armrest (2) from cover (3) for center armrest.
Fig 1: Removing & Installing Cover For Center Armrest