The lowest price component in this Battery - Xl500s 79-81 parts-list fiche is the Screw,tap.,4x12.
Some items from this specific schematic: Battery,6n4, Band,bat,mounting, Batt,assy6n4-2a-4, Hinge B,battery.
The Screw,tap.,4x12 is the most widely applied product in the XL500S 1979 (Z) USA BATTERY - XL500S 79-81 ( three times ).