51 21 370 Removing and installing/replacing cover (seal) on front door at bottom left or right

Detach cover (1) in direction of arrow from front door (2).

Fig 1: Detaching Cover

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Begin by clipping in at rear (B-pillar) (risk of damage).

Clip clips of cover (1) correctly into bores (3).

Installation: 

Clips (1) of cover (2) must not be damaged.

Fig 2: Identifying Clips Of Cover

Courtesy of BMW OF NORTH AMERICA, INC.

Cover (2) has an aluminum insert (3).

Only press on clips (1) when installing otherwise cover (2) will become uneven.