The Ford part number for it is F4TZ-10884-B but Ford shows it as a discontinued part. You could try that number at a dealer and see what they come up with and see what their price is.
I think that if it was me with what it cost I just might plug the hole or not worry about it. All it is for is the light on the dash that tells you that the engine is overheating so if you watch your temperature gauge you would be alright.
When I had my motor rebuilt, they didn't give me that sensor back, and I fought trying to even find out what it was. After I followed the wiring harness I realized it was the temp sensor, but no part stores could find it, they would only come up with the one for the gauge.
I just put a plug in the hole and taped the plug up, no lights on the dash, no harm no foul.
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