Monday, April 09, 2012 - 01:18 pm, by: Nathan Cryer(Redrodeo)
Though this might be useful info.
Tridon make both a standard thermostat and a 77 degree thermostat for the 1UZ. The 77 part number is TT281-170 and costs around $45 from Autobarn.
Another alternative is one from a Mitsubishi Magna, it is 1mm shorter overall and 2mm smaller at the small end. I have one of these fitted in my engine and it dropped the temp by 10 degrees. It is a 71 degree thermostat, part number TT299-160 and costs around $70 from Autobarn.