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A Safelite installer told me the aftermarket windshields (that insurance pays for) don't fit as well as a Ford OEM windshield when I had my Escape's replaced. I paid the up-charge for the Ford OEM and have had no issues
I am guessing the Ford oval or F-150 logo makes their glass proprietary. I know when I got my old one done they asked if it had that and since it did they went OEM.