Scott,
Our Onstar setup is mounted in the dash where a changer might go. Someone on the forum recently attempted to move the Onstar to the mirror, but has not yet reported back to us whether or not it was successful.
Have you had any luck? I know you were attempting to do this.
Klaus
Rare 2003 H2 with UM8 Integrated Navigation Radio
Skull & Bones Member since 2003