The bracket that holds the lights tends to corrode on many VX's. Mine has been a Colorado car most of it's life and the license plate light bracket is nearly rotted completely off of the car.
The screws may be rusted to the bracket on yours so be careful when you try to remove them.
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless