I should have posted a pic or two!
I thought this was common knowledge, hence the vagueness.
There is a 67 coupe version too that also has the different sub-part numbers. I'll dig it out tomorrow.
Both of these have been kicking around for 10-20 years but no bag or date.
Yes, there are those 4 numbers on the back of the weatherstrip.
You can tell they are individual pieces on the back, but not really on the front (visible side).