51 14 030 Replacing number/letter combination on rear left or rear right side panel
WARNING: This page does not describe the selected car, but rather 50 other vehicles, including the 2016 BMW M5, 2016 BMW ActiveHybrid 5, 2016 BMW 550i xDrive, 2016 BMW 550i, and 2016 BMW 535i xDrive. However, it is still accessible from the selected car via links, so may be relevant.
General procedure is described in:
"REPLACING REAR MODEL DESIGNATION "
Use same procedure as for the rear side panel.