51 46... Removing and installing/replacing cover for seat belt on left or right

WARNING: This page is about a different car, the 2016 BMW Z4, 2015 BMW Z4, and 2014 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

Lever out cover (1) in upward direction with plastic wedge.

Installation:

Make sure cover (1) is correctly seated in seal (2).

Fig 1: Identifying Cover With Seal

Courtesy of BMW OF NORTH AMERICA, INC.