51 47 ... Removing And Installing/Replacing Rear Left Or Right Underbody Paneling

Release expansion nuts (1).

Release screws (2).

Remove rear stowage lip (3) and rear underbody paneling (4).

Installation: 

Make sure rear underbody paneling (4) is correctly seated in underbody paneling.

Fig 1: Identifying Rear Stowage Lip, Underbody Paneling And Expansion Nuts

Courtesy of BMW OF NORTH AMERICA, INC.