Lee, your TO-30 thermostat goes inside the top radiator hose, no gasket necessary. Your right, this parts site does not list a thermo for a TO-20/30 for some reason. All is not lost, go over to the N parts link on this site (copied below), and you will find a thermo for the 8N/9N, which is also a perfect fit for your TO-30. The Fergy Manual lists the TO-30 thermo as 160 degree start to open, and 190 degree full open, with a 7PSI radiator cap on your TO-30. You can also buy a thermostat thru Tisco & most any local tractor supply shop. Last one I got for my TO was from a Ford/New Holland dealer. Yes, it was also listed for a N in their catolog. You can try Carquest, etc., but I'd recommend a NAPA if you try a car parts place. You will have better luck there. Warning on these thermostats, they are flow direction sensitive. If you insert it the wrong way in your hose, it WON'T OPEN, and overheat your TO in a few minutes. Look for the direction of flow arrow in the side of the thermo, the flow goes out the engine, thru the thermo, and into the top of the radiator. George.
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