3.8 Rotating / Sliding Plates

WARNING: This page is about a different car, the 2007 BMW 550i and 2006 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.

Electronic precision rotating plates for the front wheels with integrated sensor (360 degree measuring range)
Stable sliding plates for the rear wheels with a swivelling / rotating top plate
Accessories: Cover hood for aluminium rotating plates

Fig 1: Identifying Stable Sliding Plates
Courtesy of BMW OF NORTH AMERICA, INC.