Check out any of the forty E-8 Oil Pump components enlisted.
On this parts fiche the Screw Cross 6x28 is the most specified component.
Parts such as the E-8 Oil Pump: Sprkt,pump Driven, O-ring 17x2.5, Pin,split,3x25, Rotor, B. Inner are included in the Gl1200i Goldwing Interstate 1984 (e) E-8 Oil Pump parts fiche.