The most expensive part in this assembly is the Cylinder Head Assy.
In this schematic the "Washer, Plate" is used most often.
Parts such as the Cylinder Head: Plate, Breather, Gasket, Cylinder Head Side (nas), Bolt, Washer Based, Clamp(4hm) are included in the Xg250 2005 4d61 Finland 1d4d6-351f1 Cylinder Head parts fiche.