I have a nice condition set of rear calipers with carriers that I pulled off a 1990 V8Q w/102K Miles.
The car is in Southern AZ and is rust free. The e-brake levers move freely and return to their stops without any binding.
These would be great to replace the set on your V8/200 20V/S4/S6 that has frozen ebrakes.
They are also a decent rear brake upgrade for your C4 100/A6 and I can include the backing plates