OK, I've found an online post with pictures of a DIY fix.
He lifts the aluminum tabs and works it off the tank so as not weakening these tabs....said the fix took about an hour for a side.
It looks a bit distorted and makes you wonder if it's going to work , but once together it looked O.E. It sounds as though the end tank and gasket are sold as a set.
A local shop said, "they got out of this, and no longer do it," and gave me a reference. They said this type of work is "iffy" these days on getting a good job, and recommended the 35 mile drive.
Things are getting more throw away these days.
Btw, I hammered two tabs that were accessible and that happened to be at the leak spot, and it worked for now.
This was a minor leak where the coolant dripped only on shut down when cool,; when hot the expansion would self-seal it.