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I'd use a piece of #4 (identified with green tape) and a lug Listed for the conductor material and a bolt and nut. More than likely the bolt, nut and lug won't be green.

To me it all comes back to this. a regular nut and bolt are ok but in a device box it has to be green and/or listed. I think I'm going in to Wesco today and buy a box of 10-32 green screws and see if they are listed [Linked Image]