Check out any of the thirty-five Footrest (model T) components enlisted.
On this parts fiche the Washer(12.6x24x1.9) is the most specified component.
A sample from the products for the Footrest (model T) include: Bolt(10x28), Washer(12.6x24x1.9), Washer (8.2x24x1.6), Holder,footrest.