The McCormick 6657856A1 is a genuine left rear light assembly designed for McCormick X4, X5, X6, X7, and X8 series tractors. This versatile light also serves as an OEM replacement for various Case IH models including MAXXUM, PUMA, and OPTUM, as well as New Holland T5, T6, T7, T8, and T9 series tractors. Measuring 330mm in length, 140mm in height, and 100mm in width, and weighing 0.8 kg, this light ensures proper signaling and visibility for agricultural machinery.