The Washer, Plate(3dm) is the lowest priced item on this Bras Arrire schematic.
Parts such as the Bras Arrire: Seal, Guard, Shock Absorber Assy, Rear, Cover, Thrust 2, Washer, Plate (j18) are included in the Xv240 1989 3kf1 France 293kf-351f1 Bras Arrire parts fiche.
Of all the components used in this assembly the Shock Absorber Assy, Rear is the most expensive.