The most reasonably priced component used on the Gsx1100g 1991 (m) (e01 E02 E04 15 16 17 18 21 22 24 25 34 39 53) Fuel Pump is the Bolt(6x20).
Parts such as the Fuel Pump: Hose (7x13x1000), Spacer (6.1x9x9), Protector(14.5x15.5x600), Clip are included in the Gsx1100g 1991 (m) (e01 E02 E04 15 16 17 18 21 22 24 25 34 39 53) Fuel Pump parts fiche.
This schematic depicts all components used in the Gsx1100g 1991 (m) (e01 E02 E04 15 16 17 18 21 22 24 25 34 39 53) Fuel Pump partslist.