I changed the rear sub frame on my R1150gsa (2002) and the replacement subframe , which was from a 2003 gs had this on it, its just below the rear brake reservoir.
Any ideas what it is
yes kirky I can off it on Boxing day couple of years back 40 mph and and landed heavily on the left hand side, been have a problem with pannier on that side being not as tight as fit the other side, I changed the pannier frame , no change so changed the subframe and still no change