WARNING: This page is about a different car, the 2011 BMW M3, 2010 BMW M3, 2009 BMW M3, and 2008 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.
Release countersunk metal screws (1).
Fig 1: Identifying Countersunk Metal Screws
Courtesy of BMW OF NORTH AMERICA, INC.
Lever out plastic bush/metal bush (1) with a screwdriver.
Fig 2: Removing Plastic Bush/Metal Bush Using Screwdriver