Thanks for the info. The elastic webbing sounds like a good idea. that would definately save some weight. I would just rebuild the springs on the current seat tracks, but it's more than just the zig zag springs that are bad, there are also large round springs that are all different sizes and the small springs that cross over between the larger ones tho tie them togehter. I will try and get a picture for you to look at tonight. I have found some foam in the number range that you recomended for about $60~70 for enough to do my seat backs. I'll get you a picture and hopefully you will advise me further from the pic.