I think there were a couple of years where cars did not have sufficient protection as I remember several around that period.
Lancia were the most famous for it.
Alfasud
Citroen GS
First generation Japanese cars were pretty bad as well. The famous Datsun 120Y was a rot bucket.
They went everywhere not just on the seams and sills. As you highlight the base of the windscreen was known for leaks and pools of water inside.
At least the Dolomite/Marina/1750 took a couple of years to develop rather than just perforate.
We used to refer to the Lancia's as tea-bags with all the holes opening up.
