52 13 420 Replacing padding for left or right front seat backrest (normal/semi-electric)
WARNING: This page is about a different car, the 2010 BMW 550i, 2009 BMW 550i, and 2008 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.
Operation is identical to:
Replacing PADDING FOR LEFT OR RIGHT FRONT SEAT BACKREST (normal/electric)