Has your GPS steering on your tractor quit. I understand repairs could cost the in the thousands of dollars. Use what your grandpa used, I have a set of markers that came off a tool bar with 6 row JD planter units. These are heavy duty and adjustable. Mounted on a 2.25" tool bar. They do have the hydraulic cylinders and hoses to raise and lower them, I never connected cylinders so I don't know their condition. I also don't know the disc conditions. Asking $200, OBO. I also like to trade or barter hunting equipment. I also have the toolbar with JD 3 point hitch for sale. Call or text Rick 785-569-double7 double8