the cooler on mine is made by Setrab. Mocal are pretty good too. I'd say rather than buying a "kit", just get a suitably sized heat exchanger and make your own brackets to fit it whereever you want or can fit it. Then go to a local hydraulic pipe place (check yellow pages or whatever) and ask them to make up pipes to suit, shouldn't cost much more than £20 really.
It's definitely a worthwhile mod, oil temps can get sky high when ragging and since the charger is lubricated by the engine oil too (from the factory anyway, youi can fit a stand-alone supply) really high oil temps don't do that any good.
