52 17... Removing and installing outer upper rail cover

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Move seat backwards and upwards.

Unclip cover (1) towards front.

Fig 1: Removing Seat Cover

Courtesy of BMW OF NORTH AMERICA, INC.

Driver's seat only:

NOTE: Version with end fitting pretensioner.

Feed cover out of seat mechanism:

upwards,
slide towards rear

Feed out cover.

Fig 2: Sliding Seat Mechanism Cover

Courtesy of BMW OF NORTH AMERICA, INC.