remanufactured, dual speed, 540/1000 RPM, for mechanical PTO381512R91Fits International Tractor(s) Hydro 100, Hydro 186 (s/n 11999-earlier), 706, 756, 806, 826, 856, 886 (s/n 16999-earlier), 966, 986 (s/n 23999-earlier), 1066, 1086 (s/n 47999-earlier), 1206, 1256, 1456, 1466, 1486 (s/n 25999-earleir), 3388 (s/n 10384-earlier)Replaces International OEM nos 381512R91Uses 12 spline input couplerQualifying dual speed cores will receive $250 off