Need some asap help on a coolant temp sensor

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Hi folks. I just swapped in a BeCool radiator for a Gen1 (I believe) into a Dakota and am almost done, but I can't seem to find a bolt to plug the what I believe is a coolant temp sensor?



(pardon the socks) The port is in the pic, right in the front corner. It seems to be either a 1/2" or a m12, perhaps m12 1.50 or 1.25 pitch? I didn't have any luck at Osh, and am completely clueless.

Anyone who could help me out gets an e-Beer.

Thanks!

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Figured no one would know this. Guess "close enough" and some JB weld will do! Thanks