Parts such as the Fuel Injection: Damper, Ring-o,9.5x1.9, Tube,3x7x17&190, Nut,6mm are included in the Ksf450-b8f Kfx450r 2008 Usa Fuel Injection parts fiche.
The Bolt-flanged-small,6x is the cheapest item from this partsfiche.
In this schematic the "Bolt-flanged" is used most often.