Which Junkyard Electric fan?

I recall seeing a dual relay setup sold on ebay for the Ford 2-speed fan. I recall each relay is actuated by a different temperature sensor. Also, much info on the HAMB hot rod site, since they have big problems with cooling, given a rod's small radiator area.

For a simple assist fan, many use the pusher fan on M-B 300 or other Euro cars. In my M-B 300D that fan is to help the AC.