The Screw, Flat Head is the cheapest item from this partsfiche.
Parts such as the Shifter 1: Pin, Cotter, Gasket, Drain Plug (mca), Shift Cam Assy, Stopper, Cam are included in the Gtm80x 1975 Usa Shifter 1 parts fiche.
The twenty Gtm80x 1975 Usa Shifter 1 component parts are all listed in this schematic.