The lowest price component in this E-3-1 parts-list fiche is the Screw,pan,6x10.
Some items from this specific schematic: Washer,sealing,6., Dowel,pin,8x14, Bolt,special 6mm, Oil Seal16.5x25x5.
On this parts fiche the Bolt,flange,6x32 is the most specified component.