Check out any of the twenty-six Footrest components enlisted.
Parts such as the Footrest: Bolt(8x31), Bar,pillion Footrest,right, Holder,fr Footrest,l, Washer are included in the Gsx600f 1996 (t) (e02 E17 E22 E25 E34) Footrest parts fiche.
On this parts fiche the Washer(12.5x30x2) is the most specified component.