The McCormick 6623843A1 Seat Base is a genuine OEM component designed for various McCormick X-series tractors. This essential part provides the structural foundation for the operator's seat, ensuring stability and proper mounting. It is compatible with McCormick 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, X7.690, X8.660, X8.670, and X8.680 tractor models. Weighing 11.00 kg, this seat base is built to OEM specifications for reliable performance and direct fitment.