170AMP, 12V, 1-2" Single Foot, K6 Pulley with Internal Regulator & Isolated Grounding. 1" Motorola-Style Mounting; Typical for Westerbeke, Lehman, Hino & Pathfinder Engines. 2" Delco-Style Mounting; Typical for Volvo Penta (Gas & Diesel), John Deere, Perkins, Mercruiser, Pleasurecraft, Crusader, Indmar, Marine Power & other GM-based Engines.Features:. Alternator. XT Series. 170A. 12V. Spindle Mount (Single Foot). 1-2". K6 Serpentine Pulley. Case Ground. Internal Regulator. Isolated Grounding. This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.