I bought a pre-cut package off of E-Bay. I think the problem started when I joined the two halves the gap of the glass in the center was wider at the bottom of the frame than towards the top, so when positioning the rubber and center strip it was quite tight at the top. Then tightening the screws drawing it up was more than it wanted. I should have known better so now I will get it cut to fit and let them put it together. LOL. The bright side is the door glass fit together really well. Now I'll be gun shy when trying to put in the rear glass.