Preparation of new part
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.
Place roof outer skin in position and adjust to fit and secure in conjunction with roof trim strips.
Set four 4.2 mm dia. holes for blind rivets in areas (1).
Remove new part again and deburr bore holes.
IMPORTANT:
Do not grind/sand new part in area of bonding surfaces.