https://andover-norton.co.uk/en/shop-details/17552/hex-screw-1-4-unf-x-1-06-0652-872810-nm26948-
There should be a standard nut (033057) and washer on each to secure the horn bracket to the battery carrier.....
https://andover-norton.co.uk/en/shop-drawing/189/basic-electrical-components
(Items 48, 45 & 49*. Note the horn assembly faces the opposite direction to how it's drawn)
*(Not originally 14.1301 self-lock as listed by AN)
......then mudguard/fender, washers and self-lock nuts (items 6 & 10).
https://andover-norton.co.uk/en/shop-drawing/191/rear-fender-tail-light-and-tail-section
that's the way I initially installed the fender to battery tray/horn mount (trial fit). without putting things into a bind, I barely had any threads showing (standard nut) on the fender side. I noted I had about 3 threads showing between the fender and battery tray nut - about the thickness of a standard nut. I probably could have pulled the thing together, but didn't want to take the chance of distorting the stainless fender. adding an additional nut, increasing the bolt length by .25 inches, and using a final ny-lock nut seemed to solve several issues. fender seems firm and secure and nothing is in a bind. all other mounts, including the tail light assembly fell into place. when I dis-assembled the fender, battery tray, and horn assembly, all I had was two 1" bolts (correct), eight external tooth lock washer (4 each, each bolt), and 4 standard nuts - two each bolt. obviously not factory correct, and presently not factory, but it's the only way I could get things to come together.
there may be an issue with the upper fender mount - the one with a couple spacers. the previous owner(s) jury rigged the mount for the podtronics unit - it was mounted by one bolt on the aft side of the fender cross brace, with spacer between the fender mount bracket. i assumed it to be correct because of the rolled edge of the cross member brace - i reassembled it to that configuration -
here's a pic of my double nut/spacer assembly -
one added note. finally , battery's in place. when i got the bike, there was no battery, or even a method of securing a battery, the podtronics unit was hanging by one bolt off the upper fender bracket. the wiring was cut, spliced, and in general, a complete mess. i wasn't crazy about the original factory battery hold down, and wanted to use a more modern gel-mat battery. i mounted the battery using a couple pieces of all-thread, with top brace. mounted the podtronics unit to a sheetmetal bracket on the rear of the battery tray. i had to relocate the flasher unit to work with the lucas, service replacement wiring harness.
open to feedback and comments on the battery /podtronics mount. if I've opened a can of worms, better to address it now than later....