Hope this works for you . . . 3.5 mm and 5 mm for the openings seems to be spot on.
I am progressively improving my TCS, and now on the rear window since it is popping out of the seal at the top. The rubber has hardened and the locking strip is broken in pieces.
I ordered a seal from Kelvedon. When I got it, I noticed it was MUCH bigger than the old one: the dimension 16mm in your drawing is 21mm, and the 13mm is near 17mm.
I went to a professional screen fitter with the car and the new seal; first reaction was waouu ! "do you really want to try this?"; I said yes, and he said that seal looks to big.
Off went the the glass and the old seal ( easy job!), then we tried to install new seal and glass. We gave up after an hour and a half. Went home with glass on passenger seat ....
I ordered another seal: the dimension 16mm in your drawing is 17mm, and the 13 mm of your drawing is 16mm, so it is smaller than the Kelvedon's one, sold as a suitable one.
I also notice that the dimension between the bottom of each grove (body/glass) is 6 mm in the large seal and 4mm in the smaller I ordered.
Now waiting for the smaller seal, purchased here:
https://www.comptoir-carrosserie.fr/profil-glace-etou-parebrise-xml-162-1738.htmlYou can see different profiles here:
https://www.comptoirducabriolet.com/fr/travaux-carrosserie-voiture/joints-de-carrosserie-voiture/joints-cles-pare-brise-et-lunette-arriere-pour-cabriolets/I will report on future
success developments...