The trucks have "leather seating surfaces" or are "leather trimmed," as Ford has called them. So the sides and edges are vinyl. The large pieces are indeed leather as are the bolsters, that is "dyed," or more like painted. This is the case on the front two rows. The third row is all vinyl. In some later motels with two-tone seating, the top strip is vinyl also.
When the seats fall apart you can see it is clearly leather. New OEM style covers are available from
The Seat Shop, and they are nice quality and an exact match to the originals. They offer them in OEM style with leather on the seats, all vinyl to save a buck or all leather. A bit of a job installing new covers.
All the fluff about leather conditioning products is just fluff. The goo can coat the painted leather making it shiny, slippery, tactile, matte finished or clean but it can't penetrate the painted dye to soften or preserve anything. Just keep them free of abrasive dirt and sand and clean them from time to time. The drivers' cushions are usually beaten up at about 120K miles.
