On this parts fiche the Washer (10.1x21x2.3) is the most specified component.
A sample from the products for the Footrest include: Washer (19.5x32x2), Bolt 10x30, Rubber,pillion Footrest, Pin 20x20.
The Gs1000 1978 (c) General Export (e01) Footrest consists of twenty pieces with the Bar,front Footrest,left being the most expensive.