There is a drilling in the side of the plug in which you can put a size 3 Allen key or a Torx key T10 (usually found in the your BMW toolkit) in order to fit and remove it.
See tools
Also referred to as oil filler cap.
Aluminum protective cover for the safety switch on the side...
This adjustable licence plate bracket is made of...
These crash protectors for forks are made of cnc lathed...