51 13 045 Removing and installing/replacing front side panel trim on left or right

Removal: 

Slide trim (1) backwards slightly and lift out forwards.

Fig 1: Identifying Front Side Panel Trim

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

First thread trim (1) in at rear and press in at front.

Fig 2: Identifying Front Side Panel Trim

Courtesy of BMW OF NORTH AMERICA, INC.