With help from Jeff, I was able to track down NOS trunk weatherstrip. Buying anything for a 69 Camaro NOS is a real pain because there is not much left and those that have it want huge $$$. On the other side, going with repop can be more painful because a lot of times it is foreign junk and doesn’t fit.

The only one that is known to fit with no problems is part number 4468625 that has a white string in it.
The other later part numbers I think don’t fit very well 8723802, 9825829, and 3060942.

It was like tracking down bigfoot, but I finally found the mythical weatherstrip with the white string: