51 13 280 Removing and installing trim strip on roof frame at left or right

First lift out trim strip (1) with folding leg (2) or special tool 00 9 321 at rear, unclip rest up to front and pull out of seal (3) toward rear.

Fig 1: Lifting Out Trim Strip With Folding Leg

Courtesy of BMW OF NORTH AMERICA, INC.

Replace defective clips (1) on roof outer skin if necessary.

Fig 2: Locating Clips On Roof Outer Skin

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Installation: 

Push trim strip (1) into seal (2) at front, clip in at rear flush with edge (3) and then clip in rest.

Fig 3: Pushing Trim Strip Into Seal At Front

Courtesy of BMW OF NORTH AMERICA, INC.