Best Procedure For Flushing 13bt Coolant?

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Does anyone know the part number for the o-ring that goes around the thermostat? I reused the original when I changed the thermo a couple years ago but now that I'm doing all the cooling system work I took off the housing and the o-ring is split. Toyota does not have a listing for it as a part and it does not come in the box with a new thermo. Is the o-ring not needed??
 
I did not see one when I changed mine. Was the one that you pulled out the same size as the new one? I am very curious.

The thermo you mean? I was the same size when I replaced it a couple years ago. Gonna check Lordco as they list a universal rubber o-ring.
 
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