Front windshield set up on a Dart 67

Thank you all for taking care to answer ...
I'll have to make up my mind. But the thing that puzzles me is that the gasket that I bought from Jimsautoparts years ago is said to fit all Dart Coupe from 67 to 76 ... On a '67, the gasket would need a lockstreep and on a '68, the same gasket wouldn't ? Jimsautopart have a serious reputation of providing good spare parts no ? What do you think ?