Packard 56 Terminals?
IIRC they are 5/16" wide instead of 1/4" and may be silver plated.
If you follow the links in the Chrysler terminal thread you can find some possible substitutes.
I bought some unplated ones from Eastern Beaver just to have some that size on hand.
If you change the terminal housing, then you'll want to use what works best with the new housing.
I believe Packard 59 series are 5/16 wide versions of the 56 design, but haven't bought any.