Replace the spacer

Remove the spacer (1) completely.
Use spacer 5x5x20 mm.
Parts: Spacer 5x5x20 mm
Bond the new spacer (1) centered on the embossed mark.
Replace the damaged hook and loop tape (Dual Lock tape) (2) on the rear window and the body.
Parts: Velcro fastener (Dual Lock tape)
Bond the new hook and loop tape (Dual Lock tape) (2) centered on the embossed mark.

Courtesy of BMW OF NORTH AMERICA, INC.
Check the foam seals (1) for damage and replace if necessary.

Courtesy of BMW OF NORTH AMERICA, INC.