Well it's kind of buried under frozen leaves right now, but here's some picks of the -72H. First, mounted to the tractor:
Now, just the brackets with the deck removed:
And everything roughly in place off the tractor:
A closup of the front bumper mount:
These two hooks mount on the lower 3ph pivot pin and hook over the arms. The rods then raise and lower the assembly with the 3ph:
To be honest, I think it's a crappy design, suitable only for a perfectly flat field. There is insufficient space under the tractor for all that hardware and as a result, the mower deck bangs up against the underside on even small dips in the ground.
When it came to me, the tapped mounting holes in the tractor frame were all stripped and bent and after fixing them and trying the mower I am convinced it is because the deck cannot float sufficiently to accommodate a real-world lawn. If the dip is sufficiently deep, the weight of the tractor ends up sitting on the mower, forcing the dolly wheels into the ground if it's soft enough, or bending metal if it's not.
Maybe the -92H mounting system will be better, if you can get it sorted.