OEM gaskets for the early style windshields are still available through Skandix if you don't mind shipping from EU, or if you have a local shade tree who already does. Same goes for the glass itself, but I'd imagine the tab on mailing that is pretty brutal. The chrome is reusable and the gasket isn't
that difficult to replace. Digging all of the old butyl out isn't much fun, but it's doable with a heat gun and patience.
Here an English How-To from the Skandix website:
https://www.skandix.de/en/documents/installation-guide/front-windshield/3000012/
There's also a link for new glass and related installation accessories (gaskets, clips, sealant, primer, etc.) at the bottom of the page.