I scored some great seats from an '85 Trans am. They are the Lear Siegler seats in grey/silver. The picture shows the drivers seat which has some tears on the outside bolsters, but otherwise in good shape. pass is great shape, just a little dingy. Im going to do all the seats in black when i restore it this fall so for now, im just throwing on the covers i was using on the total junk seats the car came with. Check out the History/Restoration forum for more info on these seats.
I think these are the best seats I've seen in an american sports car through the 90's. The adjustable bolsters and leg support really make for a nice custom fit. I wouldnt recomend them for really big people. I'm 5'11 180 and they fit me perfectly. They are a little higher than the original seats.
If I had a complaint, i would say the head rest is not as far foward as i would like.
I cant wait to get them recovered!

 

I have the same seats but the covers are much worse than yours...I'll recover them as well later. As you say, they're really comfortable, I hadn't sat in such a comfortable car seat for a while. The ajustable leg pad is really a nice add on. I'm 5'9".