Parts such as the Cylinder Head: Pin, Gasket(10.5x22x2) (nas), Bolt(8x53), Screw(6x16) are included in the Dr650se 1998 (w) (e02 E04 E17 E18 E22 E24 E34) P37 Cylinder Head parts fiche.
The Cylinder Head assembly is constructed from several parts from which the Head Assy,cylinder is the most expensive.
On this parts fiche the Guide,valve is the most specified component.