I'm pretty sure the 600/750/900SS, 620/800 Supersports and 750/900SSie all use the same spacers The 600/750SS and 750SSie and 620/800 Supersports all use the same sprocket carrier The 900s use a very similar Sprocket carrier but has less machined off it so leaving the rear sprocket sitting futher out so as to give clearance past a 180 tyre