For whatever reason the Ford Taurus fans always get mentioned, but the truth is any OEM fan is a good choice:

I have a wimpy Dodge Omni fan in my 2001 Ram 360 (5800 pound vehicle) and it cools it just fine. A set-up that I seen in the local classifieds was a fan out of a Hemi Durango. It had a ceramic temp sensor built right onto the fan housing which eliminates the headache of wiring a controller. He was asking $40 dollars for it and it looked like it was almost new.

For your AAR though, something thin enough that you can hide it inside the factory shroud would be the ticket.