re; 69 Camaro A.I.M, upc Z21. item# 4, 3853846, added by revision 4 in late 1968 ( hard to read the full date in my crappy copy)
I believe some cars did get the bright zinc bolts. Some of what I understand is based on talking to other Camaro restorers who have seen these on original cars.
Never say never :>)