R4838 Gear Shift Knob for Case IH International Harvester and Farmall Tractors Gear Shift, Torque Amplifier and Forward / Reverse Black Rubber Knob Replaces 388180R2 and IHS242 Fits 1066, 2544, 2656, 2826, 3488, 544, 656, 664, 666, 686, 826, 966, Hydro 100, Hydro 186, Hydro 70 and Hydro 86 Tractors 2.75 Inches in Length, .25 Inch Center Opening