Is your BMW Z3 rear window discolored, cracked, scratched or has the rubber trim fallen off? Do you love your Z3 but worry about how much time and money it will cost to fix? Don’t worry, you don’t need a new top! Fortunately for you and your Z3, BMW uses rear windows with a zipper slider system making the replacement an easy do it yourself job. The old window is simply unzipped and removed and then the new replacement window is zipped in.