There are a few companies that make shroud/fan combos specifically for the Champion radiators. For the EC374 I have, I bought these two kits off of eBay:
The shroud itself holds the fans off the radiator about an inch. Then the fans at their center are about 2.5" thick. The fans sit side by side and are only about 1.5" tall near their edges so toward the center of the shroud/fan combo you should have good clearance.
