64 Dart Hardtop Rear window

Can anyone tell me if the bottom corners or your 64 rear window are square (90deg) or rounded. My 63 has a pretty good curve, I think the 64 is more squared off, that's why the two are not interchangeable.
My 36th Edition Holander Interchage Book says that 63 and only 63 dart back glass fits your car , no interchange#2387. The 64 Back Glass (#2702) fits 64-66 2 dr, hdtp,sdn, and 4door sedan. Hope this help you some.