The SM 2055 is a high-precision Alternator Rotor (Armature Assembly) specifically designed for the 12V / 2-Pin alternators found in Kubota compact tractors, skid steers, and industrial power units. Built to O.E. (Original Equipment) Specifications, this rotor is engineered for the specific magnetic and thermal profiles of Kubota’s smaller diesel engine platforms, where compact size and high vibration resistance are critical.