Figured it was better to post here than create a new thread on this..
I had read what there was to find online on the subject, then set out to find an installer who could source a specific windshield- Pilkington DOT 177, made by L-N in Mexico, rather than the rebranded China glass Pilkington also sells for 3rd gens.
There weren't many local installers willing to verify DOT codes. One place said they could get me the glass I wanted, but when I asked to look at it before installation, it was actually Pilkington labeled DOT 563, which is made by XYG in China.
The manager seemed more concerned with convincing me to have that one installed than with sourcing what I'd been promised. He made dubious claims, such as that the color of sticker on the DOT 563 windshield meant that Pilkington did not sell any other glass for my vehicle. Not confidence-inspiring. But he finally gave up, called his suppliers again, and found me the one I'd asked for.
Long story short- do your research, don't believe what they tell you until you see it yourself, and don't take no for an answer if they try to sell you a story.