WARNING: This page is about a different car, the 2010 BMW 535xi, 2009 BMW 535xi, and 2008 BMW 535xi. However, it is still accessible from the selected car via links, so may be relevant.
Dimensions in mm
Fig 1: Front View Body Gap Dimensions And Measurement Points
Courtesy of BMW OF NORTH AMERICA, INC.
Fig 2: Rear View Body Gap Dimensions And Measurement Points