I used a fan/shroud from Old Air Products in Ft. Worth. Aluminum shroud is very nice...looks to be 3/32" thick and bent/formed very well. 4 flaps at corners to kick out at speeds over about 40mph and a SPAL 16 inch fan (2070 cfm). Made for these trucks. I got the one with the adjustable thermostat/relay. You will need to make your own mounting tabs, but I expect you would with any of these pre-made shrouds.
You can see it here:
https://tinyurl.com/ybaon6je
