The rear seats in the GT500 are so light that it barely makes it worth it. The seat back weighs 12.7 lbs and the seat bottom weighs 12.3 lbs for a total of 25 lbs exactly. In comparison, the 03/04' rear seat setup weighs 47.2 lbs. I made 25 or so super light rear seat delete kits for the Cobras and the lightest I got them was 8 lbs. Almost a 40 lb savings. With the GT500, we'd be at a 15-17 lb savings. It would be an appearance mod only really....