68 Dart weather strip and trim questions

Also, there is something attached to the front of the side glass. It looks like a fuzzy material attached to a piece of thin plastic. This plastic is broken away from the side glass. What is this piece and is it available?

Finally, I want to modify a piece of lower windshield stainless from a hard top and install it on the convertible. I don't want to use the plastic lock strip. What is needed to do this conversion? Do I use a convertible windshield gasket or a hard top gasket? I assume some trim clips/pins will need to be installed at the bottom of the windshield for the stainless piece?(I don't want to silicone the piece inplace.)