On this parts fiche the Gasket(14.5x20.5x1) (nas) is the most specified component.
The six S32 1968 Usa (e03) Carrier-tire Lever-air Inflator-inner Tube Repairing Tool Set Ga component parts are all listed in this schematic.
The component with the lowest price in the CARRIER-TIRE LEVER-AIR INFLATOR-INNER TUBE REPAIRING TOOL SET GA schematic is the Gasket(6.2x11x1) (nas).