The McCormick 6609079A1 Arm is a genuine OEM replacement part specifically designed for various McCormick X-series agricultural tractors. This essential component ensures proper functionality and precise fitment across a wide range of models. Confirmed applications include McCormick X4.20, X4.30, X4.40, X4.50, X4.60, X5.20, X5.30, X5.40, X5.50, X6.420, X6.430, X6.440, X7.440, X7.450, X7.460, X7.650, X7.660, X7.670, X7.680, X8.660, X8.670, and X8.680 tractors.