Longbox is correct.

Mine is adapted from a C-3 Corvette with an adjustable drag-link. It has worked remarkably well, especially compared to non-power steering. I didn't have to install a new steering column or try to bolt in a steering box way up front. The only fault I had with this system is that the 'stroke' of the Vette slave cylinder was only about 8 inches and limited the right/left turn radius before the spindles hit the stops on the solid axle. The cylinder with the 12 inch stroke (I hope - haven't received it yet) will cure that problem.