Does anyone sell complete wing window assemblies for your year? If so, you might try finding out where they're made and calling the manufacturer to see if they'd tell you what they use. The trouble is, you'd likely need to speak Chinese to talk with them. LOL!
You may be stuck (no pun intended) with using some sort of RTV material. I think I'd try bedding the setting tape in RTV, then installing the glass and dressing the edge with more RTV. One of the Black RTV products would probably be your best bet.
Good luck in whatever you wind up doing.
