The lowest price component in this Fuel Tank (model T) parts-list fiche is the Washer.
This part-list fiche shows all the components that make up the Gsxr750 1998 (w) (e02 E04 E18 E22 E24 E25 E34 E39) Fuel Tank (model T) .
In this schematic the "Bolt(5x20)" is used most often.