The twenty-eight Gsx600f Katana 2003 (k3) Usa (e03) Footrest (model K1/k2/k3) component parts are all listed in this schematic.
In this schematic the "Washer(12.5x30x2)" is used most often.
Some items from this specific schematic: Bush(8.4x20x18), Bar,pillion Footrest,l, Bracket,pillion Footrest,r, Bolt(8x33).