Protect the passenger compartment

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2015 BMW Alpina B7L xDrive, 2015 BMW Alpina B7 xDrive, 2015 BMW 750i xDrive, 2015 BMW 750Li xDrive, and 2015 BMW 740Li xDrive. However, it is still accessible from the selected car via links, so may be relevant.

To avoid damage and possible dirt contamination, protect A-pillars, roof and dashboard trim panel (3) by means of plastic washer (1)
Always carry plastic washer (1) between respective wire (2) being tightened and trim panels

Fig 1: Identifying Plastic Washer, Wire And Dashboard Trim Panel
Courtesy of BMW OF NORTH AMERICA, INC.