The most reasonably priced component used on the Ksf250-a15 Kfx250 Mojave 2001 Usa Cylinder/piston(s) is the O Ring,18mm.
A sample from the products for the Cylinder/piston(s) include: O Ring,18mm, Pin-piston,12x18x57.2, Bolt-flanged-small, Bolt-flanged-small.
In this schematic the "Bolt-flanged-small" is used most often.