May still be available from the dealership. When my 07 was fairly new I bought complete set of factory take-off upholstery on Ebay. It was from a truck they put aftermarket leather covers on.
Quote:

I'm looking for a drivers side seat cover for my '06 2500.
I have 90k on the truck and it has a slight tear in it, and the foam is really sagging (Because of my big ar$e I'm sure)
I've found the seat foam for pretty reasonable - how about a factory (Gray) seat cover? Or does someone else make repro's?
Are these covers difficult to replace?
Any advice is greatly appreciated!!

Thanks!!