The header only has to have a kit 71379025 the best I remember. We have put a 500 head on a Smartrac. A couple hundred bucks US.IJ You must be talking about the combine portion at that price. I don't know if I would do it or not. The only advantage is you can set sensitivity as to movement required to activate the header valve as well as the height of the header - not the cutting height. It can be programed with a laptop as well. The old style has been very reliable as a whole. What is your problem area. SensorsIJ (Do you have one or twoIJ - the two sensor setup works better. You should have the harness all you need is the RH Switch) Combine electricalIJ We sell a few of the three spring sensors ever year, we also sell the potentiometers as well. They get damaged too.