Sorry for any confusion. I'm confident based on what I've seen that for the car I'm doing right now I have the correct parts, and they are in great condition, so I'm "all set".
The intent of the email was to document my observations to help others. I did a thorough search of the site and did not find this topic discussed, so felt that this might be a good thing to discuss.
Since I've only seen a few sand pebbles of the Mustang beach, it would be foolish to claim something like "All...67/68 Mustangs...had..."
With that said, I would appreciate if you could look for any stampings on your parts, and report back on what you find.
With a large enough sample size, we might be able to answer these questions:
1. Was there a difference between assembly plants?
2. Was there more than one supplier?
3. Were all parts stamped with the manufacturer stamp?
Ultimately would be a guide to identify original parts.
I'm very interested to see what Bob's documents reveal.