I need to replace the rear curtain in the vert top of my '95. It's got the glass window with defrost. I haven't started yanking things out but it looks like it might be a zipper along the top and held in place on the bottom by trim panel.. Anyone have any experience doing this? I can pick up a used one off a wreck for $50 but I want to make sure it's not too tough to get it off the wreck in one piece and re-installed on mine.