Topless '66 Barracuda

Pretty sure the staples were for the top. Later cars rely on the adhesive, windshield gasket, and windshield trim to hold the front edge. I would just trim it so it is cut off at the flange where the window seal seats and make sure the adhesive it good quality (3M) and applied properly. That being said- I have not done one on this body style so if you can find one that has I’d give them a listen.