Don't go to Auto Glass Xperts in Ft. Worth. They're used by ~5 Toyota/Lexus dealers around Grapevine area and said they do plenty of 100 series. Guy said he only uses screws and would not even consider using rivets even if I brought them. He understood my reasons, but would not budge. Screw that, I say.
There was a guy who owns Elite Auto Glass in Lewisville who was willing to help me, and I think he would have been good, but the rivets I got from Toyota were too small once the old ones had been drilled out by PO, but I needed to leave TX so I didn't end up doing it there. He's sort of a stern young cowboy type, but saw that I cared a lot and eventually warmed slightly. Anyway, he was familiar with the need to shorten the riven gun nose piece as stated in the FSM and said he had already done that to his, which was encouraging. I'd consider him if you don't find someone else.
Incidentally, I'm looking at these (
Swordfish 64907 - 25pc Aluminium Rivet with Plastic Cap for Toyota 841466149076 | eBay) as possible replacements that are plastic coated but larger diameter. I'm not thrilled about buying 25 of them just to test, though. Not sure if you will run into the same issue, but FYI. I ordered the side molding and rivet cover strips because mine were messed up. I also got the factory top molding rather than the bulk stuff they use, but maybe that is unnecessary. Now I just need to decide if I'm going with OEM glass, then have someone come out to remove so the old windshield so I can clean and prep myself before having them come back. The last install left gunk everywhere and I doubt someone else will take as much effort as I will.