Just tossing this in there....
You can run a 350Z VQ35DE Thermostat on a 370Z as well. There are many more options for the older 350Z thermostats than for the 370Z's VQ37VHR engine. The only difference is that you will have to remove the Pipe fitting from the thermostat and install a plug.
I made a batch of Low Temp 350Z thermostats for a 370Z owner by knocking out the pipe and tapping it for a NPT pipe plug. Sealed perfect with no leaks. Some of the 350Z thermostats open up slightly lower. Mishimotor 350Z themostats open up at 62° vs. the 370Z model at 66°.
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