When you can, post a photo of the connector too.

What you are showing with side rolled springs is a "Chrysler style" terminal. Terminal is the term you'll want to use when looking for these.
Packard 58 series and AMP Fast-on are two other groups of terminals using that form of retension.
Packard 58, like Packard 56 is strictly 1/4" wide.
Packard 59 is bigger, so that's one to look for.
Sometimes, but not always, a Packard terminal or AMP terminal will fit properly in a 'Chrysler' connector and visa versa.

Packard = Delphi = Aptiv (the most current name)

I had some luck with terminals made for Japanese motorcycles. So that's worth looking into.
http://www.easternbeaver.com/Main/Elec__Products/Terminals/Open_Barrel/open_barrel.html


Some terminals
https://www.repairconnector.com/categories/ALL-TERMINALS-AND-KITS/WIRE-TERMINALS/

These folks have pretty much all that Auvco offers. Not perfectly organized, so you'll have to hunt to se if they have the wider terminals.
https://www.clipsandfasteners.com/O-E-M-Terminals-Shells-s/259.htm

Mouser has Packard 58 in stock (some).
https://www.mouser.com/Aptiv/Automotive-Connectors/Series-58/_/N-1z0zlezZ1ehb5Z1y9jlfy
https://www.mouser.com/Aptiv/Connectors/Automotive-Connectors/59-Series/_/N-1ehb5?P=1z0zlezZ1z0wv2h

The long version here
https://www.forabodiesonly.com/mopa...e-wire-terminals.418908/#post-1972965743