Anyone know what size the U nuts are used with the OEM OBX running boards?

[tock13]

Hi, I am in need of a set of the U nuts that the OEM OBX running boards are bolted to. I bought a used set of running boards and they are being shipped with the OEM bolts but no U nuts so I don't have a bolt to take to a store to find something.

I see Amazon has a lot of different kinds but not sure of the size I need, hoping someone here may know.

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