Hatchback pop's open with force...

I don't know if this is a common problem with the fox hatch, but I am having a bit of trouble. I recetly noticed that the hatch on my 91 GT was a little off, and looked as though it wasn't sealing properly. With further inspection i tugged on the left/driver side of the wing and the hatch popped open. I then went on to replace the upper hatch mechanism that is in the hatch door itself. I installed the new peice and it still pops open!!! This is getting a bit aggravating, I have about a thousand dollar stereo in it and I'd prefer it not get stolen!

Has anyone else had trouble with their hatch? Does anyone know how to fix it?

THANKS!

This is an old topic but I finally bought a striker bushing....its a little peice of rubber or plastic that went around the striker. It doesn't pop open at all anymore and stays shut when I pull on it! Cost me $6 from mustang restore so I bought 3 just in case!!!