All of our new parts are aftermarket replacements. Compatible with Minneapolis Moline Tractor(s) AZE, ZA, ZAN, ZAS, ZAU, ZB. Replaces Minneapolis Moline OEM Number(s) 10A2227. Top Header: 4-1/8″ x 19″ Centered. Bottome Header: 4-1/8″ X 19″ Centered. Fins per inch: 7. Top & Bottom Headers have 13/8 Overhang to the Front. 20 Bolt Holes per Header Plate. All States Ag Parts Item No.