Part Number 376787R1 - A New Original Retaining Washer For The Sheet Metal On An IH 404, 424, 454, 504, 574, 606, 706, 766, 966, 1026, 1066, 1256, 1456, 1466, 1468, 1566, 1568, 2300, 2350A, 2400A, 2404, 2424, 2444, 2500A, 2504, 2544, 2606, 2656, 2706, 2756, 4100, 4156, 4166, 4186, 4366, 4386, 4568, 4586, 4786, 21026, 21206, 21256, 21456, Hydro 70, Hydro 84, Hydro 86, Hydro 100 Tractors, Farmall 140, 504, 544, 656, 756, 806, 826, 1206, 1456 Tractors, IH 248, 258, 268, 278 Industrial Tractors. Old Part Numbers Are A27720, 3112170R11, 54-307, 61-104.  Part is used in various places on these listed models.