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woow, Accu looks like an amazing resource, if you know what you looking for.
Thankfully I've got lots of M5 stem cap bolts in the parts bin and one of those has married perfectly with the female nut off an old rim brake which will do just the job, thanks for the idea.
for the rear fender I'm sure sure I have some mushroom headed bolt cage bolts that will work and hopefully I wont need any spacer as I think I'm going to need more clearance rather than less.
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Great! Glad it all worked out. For what it's worth, for my rear guard I was able to use just a regular socket head bolt (the same profile as your stem bolt) and it doesn't touch the tire. I have quite wide guards and tires, though, plenty of space in between. It might be different with skinnier tires!
A pair of M5 cap head bolts will get you sorted. Measure the approximate length you need and you can buy either a whole pack (cheaper) or cherry-pick sizes from somewhere like Accu (spenny but better quality). Stainless is ideal.
My rear guard fits a bit like you describe, so I use a spacer (also from Accu) to make up the gap, and a small leather washer provided with my VO guards to dampen any vibrations. A little bit of rubber or bar tape should also work.