I called Riffraff to get info on 203 degree thermostats. They didn't have any but they had this motorcraft part. It is a 92C (about 198F). The engine temp on my 95 7.3 wouldn't come up so I knew the old one had gone bad. This stat from riffraff brings it right up to normal temp ranges. The gauge on the dash reads almost dead center. Delivery was on time. Part works great. Don't waste your money on anything else.