51 12 080 Removing And Installing/Replacing Trim On Bumper Trim At Rear (M3)

Release expansion rivets (1).

Lever out retaining lugs (3) on one side from below, then unclip rest of trim (2).

Fig 1: View Of Expansion Rivets

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Retaining lugs (1) on trim (2) must not be damaged.

Fig 2: Identifying Retaining Lugs On Trim

Courtesy of BMW OF NORTH AMERICA, INC.