We have a thermostat which goes into a housing.
The housing sort of resembles a traditional "V" motor water pump on the ends of it, as it has two flanges which require a flat gasket to bolt it in place (hence two required).
The housing does not need to be removed to install the thermostat hence, those two gaskets are not needed to replace the thermostat.
Depending on where and the parts you buy, the thermostat may or may not come with the gasket. However it comes, you will need a gasket.
The gasket "resembles" an "O" ring, but it really is not. It looks similar, but there is a groove cut/made in the inner surface that lips over the stat. That is the only gasket needed if you are only replacing the thermostat.
See the picture below.
The Medic
Image (Click to make bigger)
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Saturday, February 10th, 2018 AT 5:47 PM