I ordered and installed another GM12-AUXV2 unit into my black/silver 2006 SSR today.
Based on the knowledge from the install in my previous SSR, I was able to come up with a way to install this unit WITHOUT removing the dash. Thank goodness!
The connector that is inserted into the back end of the Bose head unit can be reached by dropping the ash tray door. There's not a lot of space, but enough to put a pull wire around the metal tube bracing under the radio unit. I used this to pull up the 12 wire connector (with the monster blue snaps removed) up to the back side of the radio head unit. I was able to get my fat fingers up there enough to insert the 12 wire connector into the back end of the radio unit. I then used a tie wrap to secure the wiring harness to the large metal tube brace below the radio to hold everything in place.
I secured the audio input unit to the ash try door like before but this time I used industrial strength velcro (from home depot) to secure the unit to the door instead of screws like I did the last time.
I was really not looking forward to removing the dash to install this unit and in the end I figured a way to avoid it.
I can listen to my mp3 player again.