Leather/vinyl seats?

Hey everyone
I have a 1999 35th anniversary with the two-tone leather interior (or should that be "leather")
I am wondering how much of the seats is actually leather?
I have heard that the seat portion is leather, and the back is vinyl?
How about the rear seats??
If this is all the case, what should I be using on the seats? Lexol leather conditioner on the bottom, and vinylex on the backs?
I am currently using Meguiars Gold class leather conditioner on all of the seats (bottom, side, back, head rests) but if its not doing the seat much good, then I'd rather invest my money in a product that would.
The left-hand drivers side portion of the drivers seat back has hardened a bit and I'd like to make it soft and supple again. Any help is appreciated

Thanks

Thanks for the reply-and advice.
I recently went all out and purchased an interior "kit" from Pinnacle
Pinnacle Concours Interior Kit is complete care for car interior seats, dash, door panels. Clean leather seats, leather cleaner kit, leather kit, leather car care

I'll let you know how I like it when I get a nice day to try it out. I'm really hoping it returns the "leather" to a nice feel and makes it soft again. If it does, it was definitely worth the $80