The McCormick 3656222M91 Arm Assembly is an authentic OEM replacement part designed to ensure proper functionality and reliable performance in various McCormick tractor models. This essential component is compatible with CX, MC, MTX, XTX, and ZTX series tractors, specifically for models from serial number JJE100001 and above. It features robust construction, with confirmed dimensions of 254mm length, 127mm width, and 127mm height, and a weight of approximately 0.45 kg.