I just Bought a set team vizions did. They look almost NOS honestly. My buddy whos local to me had a set done by them and fox mustang restoration who re bonds the glass completely . Hes only doing coupes so team vizions is your only option. I know he had issues with time frames. I got them second hand though my buddy waited a few months
You have to remove the inner trim panels from inside the car to access the bolts. They bolt in, but are sealed with butyl tape. You pretty much have to unbolt the glasses and slowly work the butyl tape loose.
I find the best way to do it is have a helper (or wife) simple push the glass out with both hands why you begin prying at the door jamb. Once you get it started, slowly work it away from the body carefully. They like to break right down at the point near the Mustang lettering
I've found with a heat gun they come out much easier, years ago I used to do vinyl tops and popping out quarter windows was a weekly occurrence. We would heat up the buytl and then we used to lay on the back seat and push the window out with our foot while a assistant would hold onto it on the outside.