Like Marooncobra said above. The belleville washers are on the underside of the OEM GSXR mount. The stacking order from top to bottom is:
top of riveted 'bolt' (machined end)
mirror stalk
mount
4 belleville washers
1 flat washer
bottom of riveted 'bolt' (this is the actual riveted end)
Photos of dis-assembly below.