Just curious, when you chop the top on a car with a curved windshield, or rear window, where do you come up with the glass to fit? Do you just have the original glass cut down to fit? Seems like in some cases this wouldn't work, if the curve changes from top to bottom. Do you cut the glass first, then chop to fit? This doesn't seem to be the case, 'cause on any of the "chop how to's" I don't think I've ever seen the glass as part of the photos. Or are there place$ that cu$tom bend gla$$?