I have a '74 blue over burgundy spider, with a very cloudy and cracked rear window. I am hesitant to buy and pay to install a whole new top, which is in fine condition, just to get a clear rear window. I am considering keeping the top for now, and getting a decent used hardtop. So, here's the question. Spider replacement convertible tops appear to be interchangeable from '71 to '95. Does that mean hard tops are also interchangeable across series 2, 3 and 4 spiders?