The McCormick 6637916A1 detector is a genuine OEM replacement part designed for various McCormick X-series tractors. This essential component ensures proper system operation and is compatible with models including X4.20, X4.30, X4.40, X4.50, X4.60, X5.35, X5.45, X5.55, 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. Weighing approximately 0.05 kg, this detector is crucial for maintaining optimal performance and reliability in agricultural machinery.