Alternator 170 AMP 12V 3.15" Dual Foot Saddle J10 PulleyAlternator, XT Series, 170A, 12V, Saddle Mount (Dual Foot), 3.15in, J10 AltMount Serpentine Pulley, Case GroundHitachi-Style Mounting; Typical for Yanmar, Westerbeke, Lehman & Perkins-Sabre EnginesReplaces: AT-DF-165-12-IG, AT-DF-165-J10This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns. - cis2:mm5mnJlm -Brochure (pdf)