Model Compatibility: Fits motorcycles requiring a rectifier voltage regulator with part number 21066-0768 as specified in the accessories list. Functionality: Restores rectifier and voltage regulation functionality for systems designed to use part number 21066-0768. Part Type: Replacement rectifier voltage regulator intended solely for use as an accessory matching the 21066-0768 designation. Specification Match: Matches the electrical function and physical interface of the 21066-0768 component as indicated by the part number in the title. Installation Purpose: Designed to replace the existing rectifier voltage regulator where the 21066-0768 part number is specified for compatibility.