Black Magic. Here's two pictures that might help you.
http://www.members.shaw.ca/tetracant...Rover/Fans.jpg
http://www.members.shaw.ca/tetracant...Controller.jpg
The flex a lite dual fan shroud has a rubber gasket around its flange - sort of like the welting around your doors. This gasket is crushable and makes a nice seal to the rad core fins. The bottom of the shroud pushes into the rad metal surround and needs no attachment. I only used two clips in the top of the shroud - very easy. The electrical hookup may need a creative touch however!
