Thanks for the help on this problem.
I found my problem.
The dash material wrapped around the dash and down into the radio hole. It was covering the lower left and right of the head unit mounting frame. When sliding in the GA9166 it would contact the excess material and not seat on the actual frame. It looked OK but it wasn't. Since the material only went halfway up the frame it caused a fulcrum for the radio to rock on when tightening the screws at the top, thus causing the bottom to pop out.

Removing the material only took a box knife and a little care not to cut the wrong thing. I attached a couple of picture of before and after.

Attached Images