I found one in a wrecking yard on a 2005 Crossfire coupe. I took it and the mounting button, unplugging it from the harness under the Homelink and dome light.
My SRT6 convertible is not accessible to me until January. It had the non-auto-dimming mirror which fell off, button and mirror both. I am hoping it has the plug for the dimming mirror, but if not I see a thread here where a forum user installed one using his own wiring due to no harness plug available. In that thread he mentions that he had been told that the plug did exist in those models.
Do you know if the plug for an auto-dimming mirror exists in all models regardless of mirror type!