Part Number 713778R1 - A New Original O-Ring Seal For The Crankshaft Seal On An IH D-155, D-179, D-206, D-239, D-246, D-268, D-310, D-358 Engines, CaseIH 1620 Combines, CaseIH 782 Cotton Pickers, IH 782 Cotton Pickers, IH 275, 375 Self-Propelled Windrowers, CaseIH 4000, 5000 Self-Propelled Windrowers, IH 278, 385, 433, 454, 474, 484, 485, 533, 553, 574, 584, 585, 633, 644, 654, 674, 684, 685, 706, 724, 733, 744, 784, 785, 824, 833, 844, 884, 885, 2400A, 2500A, Hydro 84 Tractors, CaseIH 385, 395, 485, 495, 585, 595, 685, 695, 885, 895, 995, 3220, 3230, 4210, 4230, 4240 Tractors, CaseIH Industrial 248 Tractors, IH Industrial 258, 268, 2706 Tractorss.  Old Part Number is 713778R11.