I am unable to find a source for high strength (heat-treated?) metric bolts and nuts in Xterra sizes. I've checked with all the auto parts stores in town, Home Depot and Lowe's have no large metric sizes. The closest I've found is Ace Hardware, but those are just normal strength, I'd prefer to get high strength one's for use on my X. The particular application I'm looking for is to attach some homemade rock sliders to the sides. I plan to drill out and retap the existing step rail holes with larger bolts. Any suggestions where I could find these (internet or otherwise)?

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