1969 Dart Front Speaker Dimensions
Speaker is a 4" x 10".
It mounts to a bracket, which in turn mounts to the underside of the dash with bolts whose heads are covered by the defrost vents.
Which dimensions do you need? Hole to hole on the tabs on the ends? Or the holes on the speaker that mount to the bracket?
Not my picture, but you can see how the bracket mounts to the dash.