A sample from the products for the Crankcase include: Plug-oil Drain, Crankcase,lh, Bush-output Shaft, Gasket, 10,5x16x1 (nas).
Of all the components that make up this Crankcase the Screw-cntsnk Hd,6x16 has the lowest price.
In this schematic the "Screw-pan Head,6x40" is used most often.