WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Position Of Seal On Front Door
Courtesy of BMW OF NORTH AMERICA, INC.
Area (A) at distance (F) to door fold.
Area (B) at distance (G) to door fold.
Clean bonding surfaces on paint with adhesive remover (sourcing reference: BMW Parts Service).