I saw the how-to on doing some things with the existing seats but I need to get rid of my seats entirely. Has anyone had any luck changing out their seats? My drivers seat is not comfortable and since there is no lumbar support, it's starting to damage my back. I can't sit in it for long periods of time without needing a visit to the chiropractor. Ideas? Options? If not, I may have to rebuild the seat with some foam and an electric knife.