Some items from this specific schematic: O-ring,14.8x1.9 (, Gasket,cylinder (nas), O-ring,13.8x2.5, O,ring.2,4x9,4.
Of all the components used in this assembly the Gasket Kit,a (nas) is the most expensive.
This schematic depicts all components used in the Cn250 Helix 1999 (x) Usa Gasket Kit A partslist.