I purchased my mirrors from Jason:
http://www.burtmanindustries.com/zoo...n_sig_mir_heat and got them within a few days.
I really missed not having the heating mirros this past winter (New Jersey) so from what I read here it seemed as though the heated mirror wiring (2 wires each mirror) might already be in the doors.
If you pop your door panel off (take 5 minutes) and look at the harness coming from the mirror into the door, that plug/connector on the door has 3 wires going to the mirror and 5 wires going the other way back into the car. (This is for a 2005 SR5) I vampired these 2 extra wires and ran wire up into the mirrors and connected them to the heating element connectors.
Now it works like stock with the rear defroster. (it was foggy the other morning)
Sorry I didn't take any pics...I will take a few when I do my speakers soon.
Of course the LED Signals work and look great!
Rich