Just so I have a better understanding, if a Camaro required the quarter louvers, they were installed by Fisher? Did the stations (I'm assuming there was one on each side right and left) installing the louvers also have a tool/jig for punching the holes required, or did that happen earlier in the process? Unless the hole punching/louver installation was done at the same time, it would require an error to be made at 2 places on the line in order for a car which was required to have louvers to end up without them.
Is it possible that a car could have been ordered by a dealer with special instructions to have the louvers deleted?