I gotta agree with what has been said here. My plastic rear window gets attention when folding to minimize kinks, black top bows and leave top up when not in use. I have done the same thing for my catalina for 15 years and the top fits nice and the window still is reletively clear.

As for the cocktail shakers, I have ridden in ones without and with. I personnaly can tell the difference the things make. I would recommend starting the search now is it may take quite a while to locate all 4 and the necessary brackets. Also keep in mind the fronts on a 68 have an additional bracket that no other year had which makes it even more fun. I have only seen one listed over the years on Ebay, but it sold for way more than what a chunk of bent flatstock should. I do have them, but are in poor shape. I've been considering making a set for myself. I just gotta find the presized stock.