This genuine McCormick 4203878M91 ducting is an authentic OEM replacement part designed for various McCormick X-series tractors. It ensures proper airflow and system functionality, maintaining original equipment specifications. Confirmed fitment includes models such as X4.20, X4.30, X4.40, X4.50, X5.20, X5.30, X5.40, X5.50, 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. With precise dimensions of 95mm length, 51mm width, and 51mm height, and a weight of 0.12 kg, this ducting is built to exact standards.