I have some interesting information that I obtained from the archives on the '13 Roadster rear window. It appears it is smaller than the touring car, and possibly a different size than the '14s as well. I know Dan Treace has posted window sizes many times, and this may conflict with some of his data. I don't always go 100% with what the archives says either, because sometimes what Ford did at the factory is not what is on the print...but it is a start.
Length 16 1/4, height 8 1/2, radius 22 3/4.
Here is the size of the rear window on Kim Dobbins original '13 touring: Length 17, height 10, sides 7 1/4. I just posted more photos of my '13 roadster on an earlier post this month.
In what thread did you post pictures of your '13 roadster?
It is titled Another T Back on the Road, and I posted it on 6 January.
I guess the photos didn't post, so I'll try it here. I plan to drive this car as I restore it, that way I can have continual enjoyment.