Weather Stripping 69 Dart
As said the front speaker is between the two defrost vents if it had or has one. The rear package tray behind the back seat would have two or three openings for 6x9 speakers too.
I'm currently installing a Sony touch screen (replacing a Retro Sound stereo) in my 69 and have the dash apart. If you need photos let me know.
On weather stripping look to Steele Rubber. They are known for making the only correct upper glass channel weather strip for 2dr HT cars. Not sure what they have for the 4 dr sedan.
Automotive