This genuine McCormick 6645832A1 duct is an essential component for maintaining proper airflow within various McCormick X-series tractors. It is compatible with models including X4.20, X4.30, X4.40, X4.50, X4.60, X5.20, X5.30, X5.40, X5.50, 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. The duct measures approximately 95.25 mm in length, 50.8 mm in width, and 50.8 mm in height, with a weight of about 0.054 kg.