WARNING: This page is about a different car, the 2018 BMW X4, 2017 BMW X4, 2016 BMW X4, and 2015 BMW X4. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Foil (2356848)
Courtesy of BMW OF NORTH AMERICA, INC.
NOTE:
Silhouette foil (set) for special tools 2346947, 2344569, 2318573, 2348128, 2353020 and 2351398