I finally took the window apart yesterday afternoon. Yes my window rail is split at the bottom towards the front. Nevertheless I took everything apart and cleaned and applied tons of Ace Hardware glue that supposedly adheres to glass. I let it seat for over 24 hours. The window is working fine. I am still going to source me a rail and new rubber insert.
Thank you once again.

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1976 280C
SLOWER DRIVERS KEEP TO THE RIGHT.
DRIVE RIGHT PASS LEFT