I agree with firstgenaddict, there was a normative practice, but there were anomolies. First, MOST of the people working on the assembly lines were not a bit concerned about the collectability of these cars. I did a post about a year ago (Correct Seat Belts) for my Early- 11A build '67. I have a complete matched set of date correct Seat Belts that came out of my car. Everything is correct, except for one thing, they are ROBBINS. I've been told that ROBBINS were never installed in Camaros. I KNOW they have not been changed in the past 24 yrs. ('86)and maybe even 3 more years before that. Who, would change a whole complete set of seat belts, and make sure they were date correct??? And, would they pull a car from the line for seat belt if they knew they could substitute others with the exact same specs.
? I am planning to restore and use these belts, because I believe the car left the factory with them. I know this situation does not pertain to this topic exactly, Just saying I agree 100% with firstgenaddict.