Get some blue painters tape and tape the thin black rubber to the windshield all the way around the glass the long way and short way the 2 foot end and 4 foot end. you will need a small role of tape The glass should look like a mummy when you are done. Wrap the tape around the face of the windshield so it has large X shaped patterns of tape on the glass from tapping legnth to legnth. You will trim it with a razorblade along the chrome, and the little pieces of tape will be behind the chrome probably in 4 or 5 sponts on the end and on long front maybe 8 spots
If you cannot find the correct thickness of rubber, go to a windshield shop and see if they will sell some of theirs. Those guys usually have some stashed out for old cars.
Steve