I can't tell you when they were painted but I have a good friend that his first job with Chrysler was putting the wheels on the cars at one of the assembly lines. He stated the worst part of the day was after lunch (fill in the blank as to what was consumed) when the mount and balance guys would send the wrong wheels down the chute and you had to put them on the car, there was no stopping the line for that kind of thing. So out the door they went where the wheels would get swapped along with blemished tires and change of wheel production dates some cars could get several different date coded wheels.