52 15 420 Replacing padding for left or right front seat backrest (sport/manual)
WARNING: This page is about a different car, the 2008 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.
Operation is described in:
Replacing backrest cover for left or right front seat . See 52 15 405 Replacing backrest cover for left or right front seat (sport/manual) or 52 16 405 Replacing backrest cover for left or right front seat (M3 sport seat) .