Part Number: 5TJ-81960-02-00Metal construction with heat sink fin design. Help to dissipate excess voltage and heat. Improve charging capability, prevent overcharging battery. Oversized heat sink fins design for maximum heat elimination. Efficiently improve charging capabilities. Direct replacement to your original unit. This is Non-OEM product, accessory only! Fitment: Yamaha WR450F 2003-2006Yamaha WR250F 2003 -2006Package Included: 1 x Regulator Rectifier