I acquired a '98 Z3 earlier this summer with only 12700 miles on it, so it is in very good shape. It came with a full cover for winter storage, and also a rear window protector in a vinyl pouch. I'm not sure how to use it so haven't yet. It has two cloth tabs on it and I'm thinking maybe you tie those to one of the cross bars under the top before lowering the top. My question is, does anyone use these and does it really do any good. And am I correct in how I think it is put to use. The rear window is still pretty clear, but does have a mark across the middle where it gets folded.