51 31 284 Removing and installing/replacing lower cover on rear window

REMOVAL: 

Unclip trim strip (1) from retaining strip (2) in direction of arrow.

Fig 1: Removing Trim Strip From Retaining Strip

Courtesy of BMW OF NORTH AMERICA, INC.

INSTALLATION: 

Engage trim strip (1).

Fig 2: Engaging Trim Strip

Courtesy of BMW OF NORTH AMERICA, INC.