The lowest price component in this Fuel Tank (s1-b/c) parts-list fiche is the Spring-hook.
Some items from this specific schematic: Gasket-fuel Cock Cup (nas), Gasket-fuel Cock Jont (nas), Pin,3x18, Cap-assy-tank,fuel.
The Kawasaki FUEL TANK (S1-B/C) has sixteen products enlisted in the schematic.