I was wrong about the seats but everything makes sense now. One of the guys I work for use to race Mazda Rally cars, so the seats are actually out of a Mazda 323 GTX (I think that's the one), not a Prelude like I thought. I never knew Mazda offered seats like that in the 323! Anyway, he apparently bought the car brand new back in '88 or something like that and stripped the seats out right away since the car was transformed for racing. Unfortunately, the seats are no longer in new condition. They are moldy, dirty, kind of squiched (things stacked on them), and probably have rat pee on them. However, I would want to put new coverings and such on anyway, so that's not my big worry.
Since I was already plenty dirty, I went ahead and sat in one briefly while it was on the floor. It felt really good to me, but it was only a quickie.
Here's the issue I'm wondering about. I haven't talked to Greg yet, but his Brother was there today and said the seats would probably not hold up well for serious offroad use. Apparently the seatbacks can break if enough force is put on them and that's why Greg put true racing seats in the car. I don't really do serious offroading or racing, so I think they would probably be OK unless I went off a cliff backwards. Maybe they can even be reinforced somehow.
Anyway, I'm going to see how much he wants for them. Apparently he's planning on putting them on eBay, but maybe I can save him the trouble. If the price is right, I may be willing to play with them a little and if they don't work in the X, they could still be turned into really nice office chairs!