Gerhard
@Gerhard O ,
Sorry but I have not replaced a rear cab flat glass yet. I can't access my spare glasses and weatherstripping at the moment so have no measurements to offer. Here in the States many will simply have glass cut at a local glass/window shop, but of course it is not "original" or have the Asahi Teq markings. Certain countries and jurisdictions require either tempered or laminated glass on vehicles they import or manufacture, some only specify for the front windscreen. You're fortunate if you already have the 2 different curved corner windows since all else is flat and able to be cut.
As I mentioned in that earlier post years ago, Toyota offered two thicknesses of flat glass, likely for the same jurisdictional requirements. I highly doubt any current "inspector" could tell the difference from simple observational examination unless the two different thicknesses were side-by-side. I would go with the new weatherstripping that is available as I have plenty of examples of how over time the previously installed rubber shrinks, hardens, and cracks. I've used a soft, flexible, putty-like, 3M brand black caulking "rope" to seal areas of weatherstripping before that have small gaps, and it might help with any areas you may encounter. The material remains soft much like modeling clay.
Sorry to not have your answer. Good luck with your project !