The Bolt, Flange(4du) is the cheapest item from this partsfiche.
A sample from the products for the Cowling 1 include: Screw, Round Head(55k), Clamp(3yl), Mole 1, Nut, Self-locking.
With a quantity of seven pieces, the Screw, Binding is the most used part in the COWLING 1 diagram.