I just had my driver seat rebuilt on my 96 at 29Kmiles. I had some leather replaced and the seat padding changed/added with MUCH stiffer padding and MORE of it. What a difference it makes, I no longer feel like im sitting in a hole. The shop said the seat construction on Corvettes suck big time and they re do many C4 and C5 seat systems. He also said that C4 construction is bad but C5 is even worse and had 2 C5 Cps. in the shop as well.