The twenty-two Mt1 Minitrail 1971 Engine Covers ('76-'80) component parts are all listed in this schematic.
Parts such as the Engine Covers ('76-'80): Screw-pan Head,6x50, 'o' Ring-oil Fil Plug, Cover Clutch, Plug-oil Drain are included in the Mt1 Minitrail 1971 Engine Covers ('76-'80) parts fiche.
In this schematic the "Screw-pan Head,6x30" is used most often.