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I have an 04 SD with the floor console. I made a box that extends the console to the dash and has a 10" sub in it. It is not really hard to make. Basically it is a small box, square made of particle board around 1 cubic foot that has thin plywood sides and top screwed to it that I made from cardboard templates. It fires down so you need small feet to keep the driver out of the carpet. The speaker box itself is air tight and the sides and top just mold it to the dash and console. Carpet hides the wood and keeps it from squeaking against the dash and console. The box is held in by the console pushing it against the dash. See my Gallery to view the finished product.
DRT BOY, that's funny, I've been looking for an enclosure for a while and just stumbled across Pro Box's website about an hour ago and came on here to post about it, but you beat me to it.
Matt, you might also give Woodlawn cabinetry a look. He makes a box that I'm pretty sure will work. http://woodlawncabinetry.homestead.com/F250SDbox.html