On this parts fiche the Bolt,flange,6x28 is the most specified component.
Parts such as the Transmission Cover: Sw,oil Pressure, Bolt,flange,6x28, Bolt Flange 6x14, Pipe,oil Pass are included in the Cx500t Turbo 1982 (c) France Transmission Cover parts fiche.
Of all the components used in this assembly the Cover,transmissio is the most expensive.