I'm looking for help here. I recently bought a 2007 R1200GS with Vario side cases. They are beat up and I wanted to replace them. I found a pair of side cases from a 2010 GSA for a great deal and bought them. What pannier racks do I need to mount these up? Will 2010 GSA racks mount up to my GS? Will other years work? Do I have to get OEM BMW racks or will any other manufacturers racks work? Thanks in advance for any help!