Need back glass measurement please

[OKGMC4]

If anyone has a 67-72 big rear glass out I need the height at the tallest point. I am flush mounting the glass and building new window channels and in the process of setting in and removing the glass many many times I have now broken one front windshield and two rear windows. I’ve about got the rear nailed down but may have made the gap a hair too large. I may need to add some filler stock on the bottom. Thanks for any info!