Parts such as the Crankcase Cover: Gasket,clutch Cover (mca), Screw, Screw(6x10), Screw (6x45) are included in the Ts100 1979 (n) Usa (e03) Crankcase Cover parts fiche.
The lowest price component in this Crankcase Cover parts-list fiche is the Screw.
The fourteen Ts100 1979 (n) Usa (e03) Crankcase Cover component parts are all listed in this schematic.