Kit 621 Series 100A Single FT Alt MC Reg T SensorKit Includes: 621-100-SV Alternator, MC-614 Regulator, Temperature Sensors, Mounting Hardware621-100-SV Alternator: 100A, 12V, Spindle Mount (Single Foot), 1-2in, Single Deep Vee Pulley, Isolated Ground1" Motorola-Style Mounting;  Typical for Westerbeke, Lehman, Hino & Pathfinder Engines2" Delco-Style Mounting;  Typical for Volvo Penta (Gas & Diesel), John Deere, Perkins, Mercruiser, Pleasurecraft, Crusader, Indmar, Marine Power & other GM-based EnginesReplaces:621-VUP-MC-100-SR-KITThis product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.