What size/type of nut for LCA Bumper?

toolmanmike said

Pull the other side off and duplicate it. Does it have a lock washer? If it does it's probably a standard nut.

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Thanks for the reply Mike. No lock washer on the other side. It’s a locking nut. I went to Home Depot and was going to try and see what fits, but their nuts aren’t loose anymore (in baggies). Was just hoping someone knew the thread size.