I would think a grade 8 would work, remeber that 8.8 metric is a grade 5 SAE and a 10.0 is a grade 8 SAE. You will have to get it very round and smooth. I would cut it off with the ziz-wheel and then put you drill in a vice and chuck the bolt in it and use the drill as a lathe(locked at a medium speed) and round it with a file then smooth it with sandpaper.
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