While ours is a Chevrolet based "B", we put sheepskins on the front seats - and we have kitties.
Both the seats, and the kitties, are warm in the winter and cool in the summer. Wouldn't do without either. (And, sheepskins in all our cars as well - as others have said, once you have them, well ...).
Check
http://www.sheepskinexpress.com. They don't "list" Sprinters, per se, but, if you look under Dodge, they do list Sprinter. We've been using their products for nearly fifteen years, so they may well have Sprinter specs though not listed on their site.
Cheers.