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ADRAD is highly recommended. I have a build thread on my 04 GU in the members ride section. I have a heavy duty alloy radiator fitted to mine, it has 35% more capacity than the standard unit and there are comparison pics in there so you can see the difference.
I had to go to a larger one due to towing 2.5T + and also the want to push about 25psi through it. ( at 23psi at the moment.)