The Pin is the cheapest item from this partsfiche.
With four applications this O Ring(d:3.7,id:21.7) is the most specified part.
Parts such as the Oil Pump: Pin, Filter Assembly,engine Oil, O Ring,oil Pump, Pin(5x18) are included in the Gsx600f 1994 (r) (e02 E21 E22 E25 E34 E53) Oil Pump parts fiche.