The Washer,plain, 6mm is the most widely applied product in the CB450K1 1968 USA LOWER CRANKCASE ( seven times ).
Parts such as the Lower Crankcase: Oilseal,12x25x4.5, Bolt,hex 6x80, Bolt,hex,6x80, Bolt,hex 8x132 are included in the Cb450k1 1968 Usa Lower Crankcase parts fiche.
The Honda LOWER CRANKCASE has twenty-two products enlisted in the schematic.