Free GTV, man you scored!! I personally would not
remove the stock seats, cause they are pretty
comfy. You can get re-upholstry kits from many
places, World upholstry, Centerline, international
Auto, Alfaholics, OKP, etc, etc. This will be
much cheaper option than buying new seats.
I guess you could get seats out of the junkyard
from, a Honda, Acura, Toyota, etc, and get the
rails and custom install them. You are still
probably looking at at least $150 a seat for ones
in good condition, and lots of fab time.
Have fun.