I have a Duratec on an engine stand waiting to be dropped into my 97 Sable and I can't find one traditional freeze plug on it. I to see lots of threaded plugs with a allen heads. Perhaps Ford went with the threaded plugs due to the different expansion rates of brass/steel freeze plugs and the aluminum block and wanted to prevent the occurence of leaks? If anyone can take a pic of a traditional freeze plug on a Duratec, I'd like to see one.
Napa sells the Balkamp 6051608, which is a thread in type and the location is given as "front, right hand side" which sounds like it would be placed right above the oil filter. That would be the same location as shown in the OP's post. the Balkamp heater has heat protective wrap on the cord, which would indicate that it would be close to the exhaust manifold, which that threaded plug would be if it were the proper one.