I've looked around a bit and can't find a rear window for an early B body rear window. This is for the hardtop with the wrap around rear glass like on my '65 Coronet.

Try Wildcat auto wrecking. Vanessa has lots of glass from about 1500 cars that were parted out over the years.

I'll ask her tomorrow when she stops by.

Good luck!

I've been through 4 back glasses looking for one without scratches for my '63 330.

I finally came across one a few weeks ago still in the car in a guy's private "salvage". I took a chance on it and cut it out complete with dirt and moss on it. Got it home and after clean up it was nearly perfect!