This is a genuine McCormick 3668619M91 board, an essential component for various McCormick X-series tractors. It ensures proper functionality and compatibility with models including X4.20, X4.30, X4.40, X4.50, X4.60, X4.70, X4.35, X4.45, X4.55, X4.65, X4.75, X5.35, X5.45, X5.55, X5.65, X5.75, X6.420, X6.430, X6.440, X6.460, X6.470, X6.480, X6.490, X7.440, X7.460, X7.470, X7.480, X7.490, X7.650, X7.660, X7.670, X7.680, X7.690, X8.660, X8.670, X8.680, and X8.690.