I went back to that thread a studied the pics. A better view of the bottom of your front window gasket would help, What I can see looks like 68 up 2 door hardtop gasket. Not a vert gasket. I'm thinking both front and rear gaskets are the ones to reuse if you are willing to clean them.
It would be nice to help you while all the little details are fresh in my mind. When those trim clips aren't right some will beat the crap out of the trim trying to install it. Everything about R&R that rear glass is a pain due to its shape.
If I decide to sell the trim , you'll be first to know. Good luck
