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I'm guessing these are metric? So would likely be a 10.9 or 12.9Take one out and go to the hardware store and purchase a matching grade 8 bolt.
Too big for the ones at local hardware , think the highest they have are M16 / Measuring it with my caliper I believe its M20 -2.5mm x 50mmTake one out and go to the hardware store and purchase a matching grade 8 bolt.
Yep that's the first place I went , the had larger non metric but no metricWe often find larger grade 8's at Tractor Supply on our travels—