Parts such as the Crankcase Cover: Cover, Pin, Bolt, Bolt 5x16 are included in the Gs450ga 1982 (z) Usa (e03) Crankcase Cover parts fiche.
This schematic depicts all components used in the Gs450ga 1982 (z) Usa (e03) Crankcase Cover partslist.
In this schematic the "Bolt (6x35)" is used most often.