Of all the components that make up this Crankcase the Washer,plug,drain 12 has the lowest price.
A sample from the products for the Crankcase include: Dowel,pin,14x20, B/brg Rad N/com, Needle Brg, Crankcase Assy,r.
In this schematic the "Bolt,flange,sh,6x40" is used most often.