Does it use the 2057 bulb? The 2057 is a high output (brake and turn) and low output (running) in one bulb.
I got mine from superbrightleds.com, part number 1157-A51-PT. I like them because they are more visible from the side and have a protective cover. Available in amber and red (and white and...). You may have to use a 50 watt resistor to make your turn signal flashers work....google it.