A sample from the products for the Cylinder/piston(s) include: Washer,6.1x12x1, Bolt,6x12, Ring-set-piston L,o/s, Nut,cap,8mm.
On this parts fiche the Nut,cap,8mm is the most specified component.
The Washer,6.1x12x1 is the cheapest item from this partsfiche.