A sample from the products for the Frame Cover include: Spacer(6.5x10x10), Cover,frame,left, Cover,frame,left, Washer(6.5x18x1.6).
The most reasonably priced component used on the Gs750l 1979 (n) Usa (e03) Frame Cover is the Screw.
With two applications this Nut is the most specified part.