FITS TO MORE LUGGAGE RACKS THIS WAY There is nothing easier than attaching your waterproof Monsoon EVO to a luggage rack with 18mm tubes. Unless there is an obstacle at the position of the bracket. With the Bracket Shifter, you can shift one of the two brackets on the Monsoon Evo by 35mm. This makes the Monsoon Evo fit perfectly to the original stainless steel luggage carrier of the BMW GS series. Furthermore, with the Bracket Shifter, the Monsoon Evo also fits to a GIVI luggage rack (which is also used by various motorcycle manufacturers) where the lower mounts are screwed."