This Housing, Rotor is the most expensive of the items that make up this Oil Pump assembly.
In this schematic the "Gasket (5r6) (nas)" is used most often.
Parts such as the Oil Pump: Pump Shaft Assy, Screw,pan Head (646), Pin,dowel (603), Washer(6a1) are included in the Xj1100 Maxim 1982 (c) Usa Oil Pump parts fiche.