I have had a 2002 WR426, and a 2005 WR450, and they both came with a dual filament bulbs in the stock tail light. I was unsure untill today that the new LED would be wired for a brake light, but it is!!! If you take of the side cover where the CDI box is and find the wiring connection for the tail light you will notice that there is 3 wires coming from the tail light and after that connection there is only 2. It is because the third wire must be hooked up to a brake light switch. I just did this and I now have a tail and a brake light using my stock LED light. Now all I need is a liscense plate holder. It is very bright also!!