The Screw,oval,5x18 is the lowest priced item on this F-8 schematic.
A sample from the products for the F-8 include: Screw,oval,5x18, Shoe Set,brake (nas), Bolt,flange,6x28, Nut,adjust.
The F-8 is made up of components including this 45010gey010zb which is the most expensive.