I think it’s a known issue. I bought a full set of glass for my 69 gtx and my restorer said we are using the original rear glass cause the amd won’t fit. The new one is sitting in my shop storage area.

67 Coronet 500 9.610 @ 139.20 mph
67 Coronet 500 (street car) 14.82 @ 94 mph
69 GTX (clone) - build in progress......