'67 rear bumper bracket color

[Too Many Projects]

And that begs the question, were the tail panels pre-punched in line with the outer holes, or did the employees drill the holes ?

I doubt you paid any attention to them while painting the car, but there are 2 panels there and the punched holes rarely matched up perfectly and would have a little of the other showing. If the holes are perfectly aligned, I would think they were drilled at the time of install.