Installing the trim in the water channel

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Position the trim (1) as pictured.
Engage the detent (4) on the tail light.
Swivel the lower section of the trim (1) in the direction of the tail light, use the guide (3) to insert into the tail light and use the guides (2) to insert into the bumper cover.

Courtesy of BMW OF NORTH AMERICA, INC.
Feed in trim (2) in the area of the edge protection (3).
Clip in clip (1).

Courtesy of BMW OF NORTH AMERICA, INC.