There is a fan shroud (factory) available for the AD radiator. This came on big trucks with the HD radiator and it bolts right up to existing radiator.
http://www.flickr.com/photos/advance-design_parts_co/10039269655/
http://www.flickr.com/photos/advance-design_parts_co/10039269675/
http://www.flickr.com/photos/advance-design_parts_co/10039269755/