Which Junkyard Electric fan?

I bought my Champion radiator, shroud and dual electric fans from Challengergary a couple years ago. I'm very happy with it, though I should have bought a thermal fan switch from the start. I ran just an on/off switch originally. Forgot to turn it on, forgot to turn it off. I bought a thermal fan switch and it runs flawlessly. I think my whole set up was like $275 or so.