Yes that one has a O-ring around the thermostat and held in with a snap ring , (that may have rusted away years ago ) you have to check some parts stores to see if they offer a replacement, which is cast iron and not stamped steel , or go on line and buy one from button power in England , they still used that engine up untel a few years ago , good people , got a few things for my 2.8 in my pinto .