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.
This cover for the open hole beyond the swingarm pivot is...
These aluminium parts cover the big holes above the foot...
Stainless steel holder for mounting an on-board socket...