Planning some major cosmetic mods on my 2008 Fatboy. Bought a dented gas tank so I could store my original parts if I never want to put it back to stock.

I''m not building a bagger, but I like the lines of the bagger gas tanks. I'm wondering if a tank shroud would work on my bike. The retailer says it's not made for a Fatboy, but it's made for a 5 gallon tank and the tank it's made for look identical to mine. Am I missing something?