GooDeal Regulator Rectifier fit Honda TRX350FE TRX350FM Rancher ES S 4X4 Replacing OE#: 31600-HN5-671, 31600-HN7-003, 31600-HN7-A21 Please make sure your original part number matches one of the numbers listed here before purchasing to ensure fitment. Easy to install, just plug and play. Prevents over charging battery and improve charging capability. With hear sink fins for better cooling.