What size electric fan?

I tried to find a link for them last night but no luck. They are a variable speed fan controller that runs the fan speed related to the water temp. I've had mine for several years and I'm not sure now if the guy still sells them. Brian Baskins is the guys name.
The phone number on my installation sheet is 408-379-8951 and the only links I find are these:
http://www.dccontrol.com/fk50p.htm
http://www.reuters.com/article/2009/09/09/idUS106932+09-Sep-2009+BW20090909

I know some of the rock crawler guys have been getting a new 45 amp variable speed controller from Flex-a-lite at Summit to use with the Taurus fans. (Just make sure it's not the older 30 amp max model)