Ran into the same problem a couple months back. Originally bought the entire wiper blade assembly from Auto Zone, and took off the old ones where the two screws attach it, but none of the supplied attachments would work. Ended up buying just the 26 in blade inserts, and left the blade holder attached to the wiper arm.
When I took those blade assemblies back to Auto Zone, and told the guy that none of the attachments would fit, he pulled out a box of different wiper blade attachment fittings from under the counter, and sure enough, there was one there that would have worked.
Next time I buy wiper blades, I'll be sure to ask for the special attachments from the box under the counter.
Andy & Lee + Molly, the 4 lb Chihuahua
2020 Tiffin Wayfarer 25RW...towing a
2007 Chevy HHR LT2 w/2.4L EcoTec,
Blue Ox Aventa LX, Brake Buddy Classic
FMCA #F359977 - Colonial Virginians, Past President 2012-14, 2018