The lowest price component in this F-21 parts-list fiche is the Washer,plain, 6mm.
With a quantity of four pieces, the Clip,oil Drain Tu is the most used part in the F-21 diagram.
Some items from this specific schematic: Bolt,flange,6x60, Tube,8x350, Cush,fuel Tank Rr, Plate Comp L Sett.
