Back in the '90's I saw a article on either a '69 Camaro or Firebird that had the windshield & back glass openings filled in to make the glass look flush using some sort of universal glass edge molding to finish the gap.
You have to find a glass person that can cut down a similar curved window to fit. Saw it done on a show. You may have to do some chasing to find someone willing. Or google search it(YouTube??) there may be a place that has a template already made. Otherwise you can talk to local glass guys and see if they know someone.
if you REALLY want it,take your existing rear glass,wax it and wax it again.use it as a buck and make a fiberglass template. cut that to fit and have the newer one made from.
we had a windshield water jetted for a chop recently.it was fantastic.
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