I also think that the windscreen is from a Fiat 126, but i did order a seal from this car and it does not fit at all !
The thickness of the windscreen is about 5,62mm so gap E should be 5mm or 6mm. Thickness of the fibreglassstructure, where the sealing shoult fit in ( arround the windscreen) is between 2,7mm and 3mm. So I ´m not shure if Profile Ws 39 or profile W 6053 is the best choice (on
www.persicaner.at -> produkte -> Gummi und Kunststoffprofile ->sonderprofile.)
Profile W6053 is quite the same as the profile of the MIni sealing ( modern type from 1991)
Regards Roli