The eight Z750p7 Gt750 1992 Europe Uk Brake Pedal component parts are all listed in this schematic.
On this parts fiche the Washer-spring,10mm,bl is the most specified component.
A sample from the products for the Brake Pedal include: Washer-spring,10mm,bl, Lever-brake,pedal, Bolt,10x37, Nut,lock,10mm,black.