Some good info here - not sure if Jay still has any available:
Backdraft LED Conversion Kits
The exact ones I have aren't available anymore, but these look like they may be the replacements:
http://www.customdynamics.com/motorcycle_led_bulbs.htm - part number GEN-18-R-1157. It's a 1.80" Red Pigtail with 48 dual-intensity LEDS. They have a 5% off sale until tomorrow (1/2/2011).