1965 Dodge Dart Charger

slantsixdan said
The flanged speed nuts are the only type I've encountered in this kind of application. Nuts with part numbers are in Section 18 of the factory parts catalogue, but not all of them are listed -- some of them are listed with the part they hold on.

I think you might find what you need with a little careful reading of the Au-ve-co catalogue.

There's a reason they've been in business for 98 years.