The component with the lowest price in the AIR FILTER schematic is the Washer,plain, 6mm.
This Cover,aircleaner is the most expensive of the items that make up this Air Filter assembly.
Parts such as the Air Filter: Washer,plain, 6mm, Screw,cross 6x20, Screw,cross 6x20, Screw,pan,4x20 are included in the Cb750k4 Four 1974 Usa Air Filter parts fiche.