Model Compatibility: Fits motorcycles requiring the DAZE 119653-7771011 or DAZE 119640-77711 voltage regulator and current rectifier as. Technical Specification: Matches the RS5121 designation and electrical function of the listed part numbers for voltage regulation and current rectification. Replacement For: Designed as a direct replacement for the DAZE 119653-7771011 and DAZE 119640-77711 motorcycle voltage regulator and current rectifier units. Functional Purpose: Restores voltage regulation and AC-to-DC current rectification functionality when installed in compatible motorcycle systems. Installation Note: Installs in place of the DAZE 119653-7771011 or DAZE 119640-77711 unit using existing mounting points and wiring connections.