im here dude, but have never done a hydraulic conversion, but if your talkin 'bout the threaded rod i think its adjustable, and i think its just a peice of 1/4" all thread, you can get that at any local hardware store, but i have seen a bunch of pics of different hydro set-ups, and have seen 'em mounted 10 ways till sunday, so no i dont think the mounting or rod have a specific measurement, just adjust that rod or get a longer one
for different mounting spots