I just went through this... It was not at all fun hunting the box down but it has a lot to do with living in S FL, no one speaking English, and no room (land wise) for actual TRUCK junk yards... I ended up going with the Saginaw rather than the Ross HF54 Gerhard used. Both will run you 400 - 700$ re-man and I spent days looking hi and low for them and Napa does carry both boxes in their heavy truck line if you want to fork over a lot of $, but that defeats the purpose in my being!!!

I finally found a guy whom had both (had to take a translator with me to Miami).
After comparing the 2 boxes I like the 2 piston better and I agree with Hotrod's deal with PTO shafts. In the end I stepped up one size larger with the Saginaw and bought a reman kit (48$) to go in it. Gerhard had made a comment about wishing he had more pressure on the pump for his and I think its proably more in relation to how the Ross box actually transfers the fluid to power with the single piston. His over all build is the bomb though with a very clean look to boot...
I have yet to do my mounting (EUC clearance would be helpful) but I am hoping SOMEONE here will post some pics of his HINT HINT!!

The bracket will take some time to build and I will have to redesign the sheet metal under the driver side fender but im a glutton for punishment!!
If you need to reman the pump (I would for the petty cost of it) the seal and bearing numbers are in the Tech section.
Were all greedy little pic mongers around here!!!

so post pics of what you do...