The Clip,tube 5.0mm is the cheapest item from this partsfiche.
Some items from this specific schematic: Bolt,flange Sh 6x65, Tube,breather 5x3, Bolt,flange,6x60, Pin, Knok 10x14.
This CRANKCASE assembly utilises four Bolt,flange Sh 6x65(s) - the highest specified component.