All I have are the boards with a bunch of LEDs on them now. I have two stock OBS tails and two candied NBS tails that I'm working with. I got the LEDs from superbrightled.com. They are three volt so I am running them 4 in series at a time on the board with a 1/4 watt resistor for parking lights. I am researching some sort of spike protection for the bulbs now (any ideas would be great. I was thinking about a cap). A 6ohm 50 watt resistor will be mounted for the "load" so the original flasher will work (still waiting on these).
Specs on the LEDs
http://www.superbrightleds.com/specs/W18030.htm
I tried to mount (epoxy) them directly to the backside of the lens but it was too spotty. 1 1/4" seems like the sweet spot for these bulbs.