67 Dart Front Windshield / gasket problem

Also try Precision. They are the only company that makes the Mylar lockstrip amf matching gasket. (I know you have upgraded but they will make 68-9 style as well.
I would try my best to find out who is the mfg of what you have now. To avoid this problem.
I have similar issue with needing my glass removed.
Good luck!