Contour Enthusiasts Group Archives Forums General Troubleshooting Rear license plate mount

After reading what I could find here about dealing with rusted and headless screws including this:

http://www.contour.org/forums/ultimatebb.php?ubb=get_topic;f=3;t=005517

I started the process of finding a way to get my rear plate mounted on my "new" '96 Contour. I noticed that the thing the two lower screws go into has a hex head on the inside. I did not have any tool that I could get to it with though. If I were able to get something on there and turn that nut-like thing...does any one know if that would allow removal and subsequent replacement of that?