The thermostat is a thermostatic bypass. In a full flow oil cooling system all of the engine's oil flows through the circuit. Just like engine coolant you don't want the oil too cool just as much as you don't want it too hot. The thermostat closes and bypasses the oil cooler if the oil temp is low. I don't know if anyone makes a kit. It's really a pretty simple setup if you don't over think it.
7M-GE oil filter nipple P/N 90404-20173 Replaces the whole filter head assembly from the GTE.
Oil filter block adapter
Remote oil filter head
Oil Thermostat
Cooler
Hoses and fittings
Everything needs to be either 1/2"NPT or -10AN.
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