WARNING: This page is about a different car, the 2010 BMW 550i, 2009 BMW 550i, and 2008 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.
Dimensions in mm
Fig 1: Front View Exterior Body Gap Dimensions And Measurement Points
Courtesy of BMW OF NORTH AMERICA, INC.
Fig 2: Rear View Exterior Body Gap Dimensions And Measurement Points