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Hello, Frank. This shoe appears to be the older version of our more modern 15-192. Our shoe will still replace the original, but you'll note that ours has aligners that yours lacks; they appear as little bumps running along the face, next to the cam. I've often heard from customers that these aligners make the modern shoe too thick to work on older windows. With that in mind, you should be prepared to shave them off. Just note that any product altered in this way cannot be returned for a refund. See our return policy here for more information.