Welcome to the forum.
You'll find plenty of discussion on here about the subject. Just do a search and it'll come up. They are 26 gal. tanks in the short bed trucks. A couple companies make 50 gal tanks, but Titan seems to be the favored one.
You have to go into the Ford IDS via Forscan or go to the dealer and there's a menu to select a different size tank. I have a Titan 50 gallon tank and had the 26 gallon factory tank. The tank is one of the first thing I changed. The install was straight forward. The S&B tank wasn't out yet, I would definitely go with the S&B 50. IMHO.
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