Thermostat P/N for Magnusson set up

[Okusputokus]

Hey all, since the magnusson set up has you pull the tstat from the plastic housing in order to use the magnusson housing, have any of you figured out what the PN is for ONLY the tstat and not the whole assembly from Toyota or aftermarket? I just emailed Magnusson but expecting they don't have an answer. I have 120k+ miles on my tvs1320 set up and starting to see some extra heat on long hillclimbs so wanting to carry an extra tstat.
Thanks