You drive a 2000 and you're getting condensation in your lights?
You need to reseal your headlights. I believe there was a forum on that a while ago on how to remove and reseal your headlights. Something about throwing the things in the oven to soften up the glue and shit like that. I would take the lights back to the "dude" at the store and ask him why they don't fit!!
Wish I could help you with your problems!! GL!