As long as its a grade 8 bolt and above i dont see an issue with it. Which is what you have bought.
Going back to rigging we could not use anything less than grade 8 or above to lift / pull . Very similar characteristics for what we do in recoveries.
And your correct in staying away from stainless. Dont do it. Also dissimilar metal factors come in to screwing it in to a steel chassis.
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