Read this thread.
Windshield and rear window seal
The sealant you will find that I posted is the best stuff in world. I used it on my cuda and it works great!
I don't know what they are talking about a "filler strip" but your gasket should have a self locking strip. You unzip it BEFORE you remove the glass. If the car is going to be nice now is the time for new gasket as well as windshield... like previously posted. Windshields get "sand blasted" after years of service and looking though the glass gets "foggy". You really won't notice the difference until you look through a new windshield in comparison.