Parts such as the Cylinder Head: Bolt,flange 8x45, Bolt Flange 6x12, Plug(w20mr-u), Head,cylinder are included in the Gv150k1\n2b\1088801 Cylinder Head parts fiche.
In this schematic the "Bolt,flange 8x45" is used most often.
Check out any of the seven Cylinder Head components enlisted.