Mud, Thanks for the reply.
Yes, which rad to choose....the tracker is liftted, and thus has 3" of height to play with under the hood, with aprox 18" of height if I choose a "full width" rad.
As far as width goes, the tracker ain't that wide in there for the rad. I could just squeeze in a rad that is 27" wide overall.
I too want to go with dual pulling fans.