17" VortexCoulter to fit Great Plains and Tye grain drills also fits the 4 bolt Yetter bolt pattern. The design of this blade is very similar to the coulter manufactured by Osmundson Manufacturing and sold by Great Plains. Fits Great Plains, Ausherman, Case-IH 5400, John Deere 1570, Yetter, Krause, Tye, Blu-Jet, Crustbuster, Sukup Marliss, DMI, Kinze, Shoup, White.CFC Distributors Inc. has no relationship of any kind with Osmundson Mfg. Co.