A sample from the products for the Lower Crankcase include: Washer Plain 6mm, O-ring, 33.5x3, Clamper Cable, Bolt,hex.,6x90.
The most reasonably priced component used on the Cb450k1 1968 Usa Lower Crankcase is the Washer,plain, 6mm.
This LOWER CRANKCASE assembly utilises seven Washer,plain, 6mm(s) - the highest specified component.