If you can come up with a casting #, I may have one. My 70 Charger HAD a steering box from a 69 Charger until I swapped in a Firm Feel chuck and fast ratio arms. I have a few pitmans, so I will need a number to be of any help. If I have what you want, its yours for $20 plus shipping. Send me a PM and I will let you know what I have.
Greg