Cavity dimension, fixed 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 rear door.
Use special tool 51 0 342 to measure dimension (A) from inside of flange edge (1) to door window glass (2).
Window cavity gap (A):
A = 10 ± 0.8 mm measured in front of door seal in area of C-pillar.