The lowest price component in this Engine Covers parts-list fiche is the Washer,6.1x12x1.
A sample from the products for the Engine Covers include: Cover,oil Pump, Pin,dowel,8x16, Screw-pan Head,6x12, Plug,25x12.
This ENGINE COVERS assembly utilises nine Screw-pan Head,6x20(s) - the highest specified component.