Alternator 170 AMP Kit 12V 4” Dual Foot Saddle K6 Pulley Kit Includes: XT-DF-250-K6 Alternator, MC-618 Regulator, Temperature Sensors Mounting Hardware XT Series Alternator: 250A, 12V, Saddle Mount Dual Foot, 3.15in, K6 Serpentine Pulley, Case Ground Hitachi-Style Mounting; Typical for Yanmar, Westerbeke, Lehman Perkins-Sabre Engines – Replaces: AT-DF-MC-200-KIT, AT-DF-200-K6-KIT This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.