Check out any of the nineteen Cylinder Head components enlisted.
Parts such as the Cylinder Head: Gasket, Cylinder (nas), Gasket 256113960000 (nas), Screw, Hexagon, Bolt, Stud 1 are included in the Xf50 2007 15p1 Europe 1f15p-300g1 Cylinder Head parts fiche.
Of all the components used in this assembly the Cylinder Head Assy is the most expensive.