M-Body Steering Boxes?

I put a cop car box out of a Dippy into my 72 Demon (which has a '75 front end under it). The arm out of the steering box is different, going into the center link from the top where the Demon's original arm came in at the bottom. The steering arm that I got with the '75 front end, worked on the box.

If you can find a cop car box, I recommend it. It is power steering that is fast and assisted without being overly assisted. How to find when looking through a Pik 'n Pull? Look for the PS cooler.