WARNING: This page is about a different car, the 2013 BMW X5 M, 2012 BMW X5 M, 2011 BMW X5 M, and 2010 BMW X5 M. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Model Designation Sticking Position
Courtesy of BMW OF NORTH AMERICA, INC.
Stick on adhesive tape (1) according to measurement "A" to trim strip (2).
Mark measurement "B" from top edge to adhesive tape (1).