I am using LED brake tail and turn signals in my Cobra for over a year now.
I experimented with many of the different ones on the market to find the brightest ones, and settled on the ones from
http://www.cyclegadgets.com/Products/?cat=LIGHT
but i believe that Custom dynamics
http://www.customdynamics.com/motorcycle_led_bulbs.htm carries the same ones (with the side facing LED's), and they also have these really trick ones with a red brake light in the middle with a circle of LED's around the outside called Dynamic Clusters for a directional indicator which would give you four bright brake lights And blinkers.
If you have the minx style tail lights the LEDs are a
must have item ta make them far brighter than a regular lamp (because they don't have reflectors in them) and
also as a safety item because they don't heat up. There was another thread that was lost about people having fires start from things in the trunk getting into the lamp because it isn't sealed in back.