The McCormick 3679320M2 is a genuine OEM control knob designed for various McCormick X-series tractors. This essential component ensures precise operation and comfortable handling within the cabin. It is a direct replacement part, guaranteeing compatibility and reliable performance across models including X4.20, X4.30, X4.40, X4.50, X4.60, X4.70, X5.35, X5.45, X5.55, X5.100, X5.110, X5.120, 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.