I've got the seat you want, or at least it looks like it. It's out of my '92 Caprice sedan I had last winter, and is in very good condition. If you want the bottom only, the shipping increase for the whole seat bottom, compared to just the cover, may be worth it so as not to have to put it back on another a seat cushion. I shipped a RM leather seat back to a guy on ISSF in the fall and it cost just over $20. The bottom you want should be less. Let me know, It's your for the shipping price.
Mike (200OZ)