I just received confirmation from Muth that they will have turn signal mirrors available for the H3, starting early in 2006. They have been designed, tested and approved for production.
When available, I'll be happy to let everyone know. They are to notify me when the first set arrives, since I helped them out with some wiring locations, and harness routings.
Easy to install, and no drilling required.
Just pop off the door trim panel, pop off the mirror glass, run two wires (hot/ground) from inside the mirror housing, through the door to the turn signal wires and ground, then install new glass.
The new mirror glass has five or six LEDs that blink with the signals and looks like an arrow.
Muth makes most of the factory installed turn signal mirrors for GM.
http://www.kwmuth.com