The Atc185s 1983 (d) Usa Gasket Kit B consists of thirty-three pieces with the Gasket Kit B (mca) being the most expensive.
thirty-three components are shown in this Atc185s 1983 (d) Usa Gasket Kit B exploded diagram.
On this parts fiche the O-ring,9.4x2.4 is the most specified component.