1964 Chrysler 300 letter steering box

Ive banged my head against the wall trying to figure this out. Like the title says I need a new steering gear/box. and its extremely hard to find one for this model. Does anyone know if any other model Mopar has an interchangeable one with the 300 letter cars?

This car is so hard to find OEM parts for. ugh, any help is greatly appreciated.