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you may be able to open the seam above the window, reposition the straps, and reclose the seam if that's what is wrong, and the straps have enough material.
Since the top is usually stretched forward to the front bow, I would make sure it sat in the warm sun all day, then taken for a high speed ride to stretch the material (by ballooning up) before trying to release the staples at the rear.
Al Knox tops are the best fit. They are about $450.00 for the kit. You could save a little $ because you will not need the pads. But, You can pull the staples and loosen up the straps. It will be a real pain if you have to replace the straps because they are screwed on to the rear latch bow with a plate that is under the material. I would try one or both of these b/4 spending the $ for a new top. If you need any help feel free to PM me.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.