With a quantity of six pieces, the Washer-spring,6mm is the most used part in the FENDERS/SIDE COVERS/NUMBER PLATE diagram.
Some items from this specific schematic: Bolt-upset 6x14, Collar,l=4.7, Washer-plain,7mm, Washer-spring,6mm.
The thirty-five Kx400 1975 Usa Fenders/side Covers/number Plate component parts are all listed in this schematic.