www.superlumination.com
They have all kinds of led bulbs, and they sell the load equilizers which you need because these draw less power than normal bulbs, so if you did your indicators, they would flash rapidly without the load equalizers.
I bought their matrix bulbs fro my rear indicators in my w124, they work nicely., and you cannot tell they are led bulbs when they flash, they just glow a nice red color.