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.
These covers for the open holes beyond the seat are made of...
These black and foldaway Lazystep highway pegs will be...
This cover for the axle pivot for all new R1200GS LC &...