This company has some.
www.riwire.com They are called "Flag Spade Terminals".
This is where I ordered my braided wire from. Their terminals are wrong WRT my 43 GMC.
Evidently the loop type flags have been superseded by the 'butt' type.
I am going to try and get some of the butt type and see if I can mill the crimp type with a slot to get the proper look.
Since these are stamped parts, getting a custom job done for a few dozen wold be way to much money. Plus you would need about 4-6 different sizes to cover the hole and wire gauge size.
I'll post pics of what I get after I cut some up.