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

Unclip trim strip (1) first at top (A) then at bottom (B) from retaining strip (2).

Fig 1: Removing Trim Strip From Retaining Strip

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note: 

Retaining strip (1) must not be damaged.

If necessary, remove and replace retaining strip (1).

To facilitate installation, moisten retaining strip (1) with water.

Fig 2: Installing Retaining Strip

Courtesy of BMW OF NORTH AMERICA, INC.