Just fitted my old Bumot aluminium panniers from my R1250GSA onto my new R1300GSA using a set of Lone rider Motoracks for the 1300, fitted straight on. Cost £275 for the racks as opposed to £900 from Bumot for new set of panniers and frames. Also fitted my Bumot top box by drilling 4 new holes in the mounting plate and using 4 spacer 25mm long 13mm diameter with 6mm hole through.
You don't need to buy a whole new pannier system!
You don't need to buy a whole new pannier system!