51 43... Removing and installing/replacing trim behind rollover bar on left or right

Unlock convertible top (3) and raise slightly.

Pull off trim (2) towards rear.

Installation: 

Feed in trim (2) below belt guide (1) and rollover bar trim (4).

Make sure end rings are correctly seated on rollover bar trim (4).

Fig 1: Feeding In Trim Below Belt Guide And Rollover Bar Trim

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Retaining lugs (2) on trim (1) must not be damaged or missing.

Fig 2: Identifying Retaining Lugs On Trim

Courtesy of BMW OF NORTH AMERICA, INC.