Wilcom
I can absolutely guarantee that the Krauser racks, i.e. the side frames and bum-rack are identical not only across the BMW range but all the Suzuki, Yamaha, Honda, Kawasaki, Ducati, Motoguzzi, Laverda (etc!) bikes that at one time you could buy mounting kits to fit them to.
Do a google search on krauser pannier frame mouting kit and you will find a shop in the UK that has everything (virtually) except BMW kits. My offer to take photos of the mounting kit laid out on graph paper stands.