Removing and installing/replacing backrest side section on left or right rear seat backrest

Removal: 

Remove backrest side section (1) upwards to the front (A) out of the detent (2) and then remove upwards (B).

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Installation: 

Insert backrest side section (1) into the guides (2).

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Clip backrest side section (1) upwards with detent (2).

Courtesy of BMW OF NORTH AMERICA, INC.