Parts such as the Fuel Tank (e33): Tank Assy,fuel(, Stay,fuel Tank, Cushion,fuel Tank Rr, Cap Set,fuel Tank are included in the Gsxr750 2011 (l1) Usa (e03) Fuel Tank (e33) parts fiche.
The Washer(6.5x22x1.6) is the cheapest item from this partsfiche.
In this schematic the "Fastener,fuel Tank Cover" is used most often.