I'm not entirely certain, since most of the cooling equipment I use is completely custom-made - living in South Africa makes computer cooling components prohibitively expensive. For example, Thermaltake makes a 120mm radiator that fits into a 5.25" bay. Here, one of those radiators can easily cost the equivalent of $150.00 plus. By contrast, $20.00 gets you a 250x180x30 heater core from a car. Same story with the pumps, tubing, and blocks.
Can anybody else maybe add some input here?