The Stud 6x20 is the cheapest item from this partsfiche.
Check out any of the twenty-three Oil Filter - Oil Pump components enlisted.
Parts such as the Oil Filter - Oil Pump: Plug, Strainer,engine Oil, Nut 6mm, Pan,oil are included in the Gs450l 1985 (f) Usa (e03) Oil Filter - Oil Pump parts fiche.