Ooh... that's an excellent question!
I believe they do, though i think you'd have to special order the truck that way or simply special order the bed if you already have the truck. Those trucks are mainly chassis cabs if i remember correctly, so it would definitley have to be a special piece...
Sorry i can't be for certain, i only ever dealt with one of these trucks once in my sales career, and that was over 2 years ago. If you check out the website
www.ford.ca they have a contact us tab with a toll free customer help line, or you could drop them an email.
Short of calling the local dealership, that's the best i can do for you.
Good luck in your search!