Paul I have a friend who got a set of seats reapolstered in omish country for like 75 for both seats in his 82 celica. They look great. He did this a few years back. If you want I can talk to him and find out where he got this done.
Also I did a set of seats for my samurai. I had to swallow my pride, but I walked into joan fabrics and asked th ladies how to do it. I just pulled all the cloth off the seats (held on by hog rings) then I just cut out the stiching where the two pieces of fabric meet and removed the peice I wanted to replace. Then I layed the removed piece over the new fabric and cut out a piece of material. Then hand sewed it back in (this takes a while 2-3 hours per seat. also you do all this with the seat cover inside out so you don't see any of the stiching. I am not sure if the conquest seats have the plastic wire thing that runs around the edge of the seat bottom, but I could not figure out how to take that apart so you are on your own for that one.
Anyway it is just sewing. Not very hard just tedios work