Hello, wanted to update this thread with current windshield information:
Pilkington USA is out of the classic car business, and as such they do not have windshields anymore.
Pilkington UK, or other UK suppliers, are happy to crate and ship windshields to US, this will cost between $1000-1500 US dollars to your residential door, depending on who you go with. Even though that's spendy, it's nice to have a guaranteed option.
There is a man in Australia, Frank Schoenberger, who is looking to reproduce these windshields. He is at least 6 months out from getting them produced, so this isn't a guaranteed option. He expects them to be less than the UK options.
I haven't looked too much into Canada, but I wonder if any classic glass suppliers up north would still have these. Might be worth looking into that.
I found an extremely sketchy glass company online that "said" they still had one in stock in a USA warehouse, I spent a fair amount on it (but less than it would cost to import one from oversea). I should have it in hand next week, hopefully it fits! I'll report back if it does.