The sub assemblies and components that make up this Crankcase ('81 D2) include this Set-crankcase, the most expensive part.
In this schematic the "Screw-pan Head,6x30" is used most often.
Some items from this specific schematic: Oil Seal,change Shaft, Screw,pan Head,6x75, Gasket,drain Plug Bol (nas), Bearing-ball,#6205c3.