I have Relocation kit & kept stock filter too,
I PLASTIC BAG FILTER & put rag on top of diff & its ok no oil sitting there,
& i use New Fitler on Engine & move old filter to relocation,
as i run 20,000 per oil change & change filter at 10,000,
My Oil cooler has Thermostat in it,
best buy kits from states as most double there money on any kit brought here in Australia,
you can get adaptor with Thermostat in it ,
i priced a inline thermostat here & was quoted $120+,
got one from states for $45 usd,same price as TRANSMISSION FILTER KIT,
as you see both are in same spot ,
Run a good size oil line too,not a small line as you want good flow to any filter,
Cheer`s Chuckie.