At least for the Barracuda the 67 used a windshield gasket that accepted a chromed plastic lock strip (rear window too). In 68 the gasket does not use a lock strip and there is stainless trim that covers about 1/2 the gasket that snaps into clips that are attached to the body in the gasket channel (same for the rear window.

I pulled the stainless trim from a 73ish Swinger to use on my 68 Barracuda.

For some reason i have held the belief that the 4dr/2dr post cars were different than the 2dr hard tops. The Duster/Demon/Dart Sport are different for sure, the windshield is a whole differnt shape.