Fantastic Vent Upgrade Kit
I put this in. Works great, but you have to know how to use it. Quite a bit of options. I already had a Fantastic Vent. This just replaces the guts so no fooling around with caulking or any structural stuff. Comes in two colors so make sure you get the right one if you decide to go this way. Says not to place a cover over it, but whatever works.
FanTastic Vent - Product - Model 6600
2013 Ford F-350 SD Diesel, 4X4, Crew Cab, Lariat
Sabre 2014 32RCTS, Pullrite Superglide 2900 18K