Cavity dimension, lowerable door window glass
WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. However, it is still accessible from the selected car via links, so may be relevant.
Close door window glass (2).
Close rear door.
Use special tool 51 0 342 to measure dimension (A) between inside of flange edge (3) and door window glass (2).
A = Window cavity gap 9, 5 ± 0.8 mm measured in area of B-pillar trim panel (1).