Years ago, when I was restoring my ‘48 Dodge D25 club coupe I needed to replace a back window which had been shot out. Even then it was a hard piece to find as it was larger than the sedan rear window and unlike the rest of the glass it was curved. I finally came across a club coupe with only one piece of glass in it......the rear window. Found the owner and he said give me $20 and you can take whatever you want off the car. I took the rear window with good rubber moulding, both doors, trunk, hood, and a few other things. Sometimes you get deals but that was a long time ago.
Still got that rear window in my coupe.
Edit......... Ha ha, found a picture of my coupe when I first got it and had covered the missing rear window with a garbage bag to keep out the worst of the weather.