I can help you with this one. WE have a 36 ft. Macdon on our 480 cat. We've tried the floating ground contour kit, skid plates, they were even down and reangled the sickle bar back. It doesn't work near as well as our 25 ft. Flexhead. You can't get as close to the ground no matter how level the field is, and any mound of dirt or anything it will just bulldoze right over. I realize a new header is a lot of money, but you sure run a lot of dirt through the machine, and you are really pushing your luck with rocks. Bad Idea. WE do it, but its very stressful for the operator