You can adjust the 2 fingers that go into the center bar of the "T". They should have shims you can take out or add. I think taking them out will pull the top down. You can also replace the weather stripping on the tops.

Are you sure the water is coming in the rear?

Almost always, the problem can be cured with a high quality set of weatherstrip.  DaveM is right about shims in the center, and the outer front can be adjusted with the rubber-headed screw.

Larry

Rear outer corners can be brought down a little by adjusting the receiver on the halo panel.  Go slow; loosen the receiver but do not remove it.   There is a reinforcment plate behind it which will drop to the inside of the underbody if you remove the screws completey.