Never posted here before. I bought my loaded '84 black F41 sedan new (no vinyl top). It was a no radio car and I've had my Mitsubishi component stereo in it since new (it was in my '78 Impala coupe previously, still miss that car).
I found that some 2002-2005 Buick's had RDS and XM radios that almost look period correct, but they are miserable class 2 serial bus communication units.
Here is the 'original' radio. On it's last leg, I've repaired it so many time in 32 years and 257K miles in this car.
Here is the new radio with LED back lighting (missing knobs in this picture;
The whole monstrosity ready to go in the car;
The final fit. The XM antenna is just sitting in the defrost opening at the moment. That is the aux input in the radio surround on the right;
I've got lots more pics and info if any one is interested. It sounds fantastic to me!