I fitted a much larger radiator, that just fits between the two battery trays, right up against the front and just under the lip of the slam tray.

It is a 5 core unit made by NCN in City + Suburban JHB for R 2 200

The engine and gearbox oil coolers are custom made by Cirrus Coolers. They where designed to be nested so that the pipes exit neatly. These coolers are of the rolled tube design where the tubes and fins are formed out of the same piece of aluminum tubing, this contributes to efficiency while keeping wind resistance very low. They cost around R 420 each.

The air-con radiator is mounted in front of these oil coolers without any fans (no space).

All the hydraulic hoses are industrial grade crimped 2 wire high pressure hoses with screw fittings.  

I originally fitted a fixed mechanical fan, but it was too small as the chassis cross member was in the way, the result was that the water got a bit hot when towing the car trailer with the Millennium bug on.
I have recently fitted two air-con fans from a Discovery - -I removed the blades and fitted them on backwards, then fitted the fans to the engine side of the radiator as suckers. I have a two stage temp switch, 1st at 85 deg and the second at 97 deg, this seems to work fine. I would have preferred to fit two 14" fans but the Discovery ones where lying around at home...