I made a fan shroud but you don't haft to do that you can use the thru radiator straps that they provide with the fans or you can get a single Flex a light 180 for about $320.00 it is a complete kit. But I'm always on a budget so I generally DIY it my setup its on page 2 of this thread.
Parts electric fan controller from Advanced auto $35, I also run a Cole heresy continuous duty solenoid I had it from my Lincoln Marl VI fan I had first it is good for 160 amps
2 16" electric fan rated at a least 2,500 cfm yes they will fit on the radiator it is tight but they fit with 1/2" on each side I wire everything to the battery except the 12 keyed source I tapped the radio fuse & I made my Wiper & Overflow bottle hangers from aluminum 1/8" x 2" I cut the slides for the bottle with a jig saw & filed them till they fit was tight.
One Owner 2001 3500 Cummins 320,000 miles & still growing & 2001 1500 5.2 92,000 & still growing