Dylan, what you think is your engine oil cooler is actually your trans oil cooler (unless you took the trans oil cooler off and put an engine oil cooler in its place). I bought a JustJap radiator and put in a Davies Craig trans cooler where the oem oil cooler was. Then I put a JustJap engine oil cooler in the passenger side between the wheel and the bumper bar. I am actually thinking of putting the stock trans oil cooler back in to add to the trans oil cooling since I have actually reduced the volume of trans oil due to removing the radiator cooling section from the system. I plan to put the oem trans oil cooler in series, in the drivers side between the wheel and the bumper bar. I have some pics of the install if you are interested. It is a fairly easy job in terms of technical ability, but you need an amazing amount of different tools and pretty much a whole day to do it.
I did radiator, trans cooler, engine oil cooler and changed turbo in one very busy weekend.