I just went through this not long ago. The gasket/ window rubber is still available through Steele and another source that I cant remember but the glass is no longer available new through any supplier

The glass for a two door sedan is the same as 66-70 B-Body 4 door and wagon.

I bought a parts car for $1200 just to get the windshield, I have since bought a second parts car with the intention of saving or selling the glass.