On page 170 of the Wing Manual is the Fuel Tank Ground Cable installation as per figure W56.
It shows a solid rivet AN526C632R6 (could be a bolt) as it fits into a nut labelled as AN365-632A. The other end of the cable shows a similar componantry makeup while the photo 265 shows a "Philips" screw.

None of these parts are supplied in the Wing Tote boxes or as a part board component.

Are they stored elsewhere or can any bolt be substituted in this installation?