i have a kenlowe fan
its pretty good!
it comes with all the kit you need to fit it
had a thermostat that fits in the top hose of your radiator, and uses a silicone seal. quite clever really.
I fitted a switch inside the cab so i could switch the fan off in deep water (even though i forget every time)
used a relay to hook the switch up, which lights up when the fan is off to remind me to turn it on
if you want some pics just ask