The lowest price component in this Cylinder Block parts-list fiche is the Washer,plug Drain 14.
In this schematic the "Dowel,pin,12x20" is used most often.
Some items from this specific schematic: O-ring,8.4x2.4, Dowel,pin,8x14, Bolt,flange Ubs 1, Bolt,sealing,20mm.