help with coolant sensor in radiator

I'm looking for the part number for the coolant sensor that's located at the bottom of the radiator. I've tried looking at the parts stores but they don't carry it. At least none of the senders/switches match up with the thread size of my new radiator or have the same connection that my car has. The thread size I have on my new radiator is M14 x 1.25. Is that right? Any help would be greatly appreciated.

 

[fivestardsm]

You have P.M.