sixteen components are shown in this Cn250 Helix 1987 (h) Canada Kph Gasket Kit B exploded diagram.
In this schematic the "O-ring 46.4x1.9" is used most often.
Parts such as the Gasket Kit B: Washer 7.2x13x1.2, O-ring,13.8x2.5, Gasket,mission Co (mca), O-ring,24.4x3.1 are included in the Cn250 Helix 1987 (h) Canada Kph Gasket Kit B parts fiche.