52 14... Removing and installing outer upper rail trim

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Move seat backwards and upwards.

Unclip trim (1) towards front.

Fig 1: Removing Outer Upper Rail Trim

Courtesy of BMW OF NORTH AMERICA, INC.

Driver's seat only:

NOTE: Version with anchor fitting tensioner.

Feed trim out of seat mechanism:

upwards,
slide towards rear

Feed out trim.

Fig 2: Feeding Trim Out Of Seat Mechanism

Courtesy of BMW OF NORTH AMERICA, INC.