The component with the lowest price in the CYLINDER/PISTON schematic is the Pin,dowel,6.2x8x14.
With a quantity of four pieces, the Nut,cap,8mm,black is the most used part in the CYLINDER/PISTON diagram.
Some items from this specific schematic: Clamp,cooling Hose, O Ring,18mm, Bolt-flanged-small, Pin-piston.