54 34 359 Removing and installing/replacing inner trim for left or right guide rail

Unclip guide rail trim (1).

Fig 1: Unclipping Guide Rail Trim

Courtesy of BMW OF NORTH AMERICA, INC.

Replacement: 

To avoid rattling noises, it necessary retrofit felt as pictured on trim panel (1).

Fig 2: Identifying Trim Panel

Courtesy of BMW OF NORTH AMERICA, INC.