The most reasonably priced component used on the Pa50i Hobbit 1979 (z) Usa / 20 Mph Crankcase / Inlet Pipe is the Bolt,hex 6x25.
Some items from this specific schematic: Gasket, In. Pipe, Screw Cross 6x45, Stud, 6x31, Gasket,crankcase.
This part-list fiche shows all the components that make up the Pa50i Hobbit 1979 (z) Usa / 20 Mph Crankcase / Inlet Pipe .