What other steering gearboxes fit?

I have a 71 Challenger that had a leaking steering gearbox. I had taken it off and was going to buy a reman. from Napa. Took my old one in and found out that they don't order a replacement but send yours out for R&R. That was about a week ago. Counter person said it would take a week to get back. Cool. Woodward was 2 weeks away so I had more then enought time. Called today (! week later) to see when I can pick it up and low and behold, no gearbox. He said he would call and see what happening with it. He calls me back and they cannot find it! No tracking number, nothing. Long story short, if they cannot find it, is there any other gearboxes that would fit a Challenger to replace this. I have a feeling Napa will be buying one Monday for me.

Practically any Mopar from the early 60's through the late eighties... The Pitman shaft changed to a larger spline around 73, the large spline pitman arm is still available unlike the small spline that sells for big $$$ there are slight variations in the pressure fitting/hose but that is handled by transfering the original adapter that you no doubt sent in with your box....

I got one from Meridian Auto in california. Nice unit, you have to send your core back but it
was only 200 complete.