PS pump fitting size/type?

It is probably proprietary. Since I can't see it and am not familiar, some generalities.........

Try to find one at a junk yard.

If it is steel there is a couple of options.......Cut it off and braze a standard hydraulic fitting onto the hose. Then you can have a section of hose "made up" either with screw on or crimp on hydrolic fittings.

Weatherhead and others make compression fittings.......a heavy duty compression fitting on a hose end. You can clamp it right onto a "stub" of the original steel end. This may or may not work on metric tube, and the hydraulic outfits may HAVE metric compression ends by now