So, the change is done. As "usual" unfortunately not enough pictures made...
But here's my how-to, hoping it might help someone.
FIRST AND FOREMOST: DISCONNECT THE BATTERY!
Then I took off the instrument cluster bezel, removed two screws of the old radio and disconnected the few connections on the rear (it's basically only one connector for 12V and light, one 2-wire for the front speaker and one single wire for the rear speaker.
I hooked up the new radio as follows:
12V (IGN) -> replaced...
Change AM radio to Retrosound - 79 LeBaron
