On this parts fiche the Gasket,oil Pump (mca) is the most specified component.
Parts such as the Clutch Cover - Oil Pump: Pin(2.3x7.5), O Ring(d:1.05,id:3.1), Union Bolt, Gasket(6.2x11x1).2 (nas) are included in the Jr50 1991 (m) Usa (e03) Clutch Cover - Oil Pump parts fiche.
twenty components are shown in this Jr50 1991 (m) Usa (e03) Clutch Cover - Oil Pump exploded diagram.