Robert: All this is interesting... For what it's worth, the "spool" valve, if that is what it's called, is a USA sourced item in my Kubota PS kit, and it is spring loaded ( it'll compress/extend about 1+" in either direction) so the steering still works when there's no hydraulic. Everything else is either available from suppliers of hydraulic stuff, or, in the case of the tie rod ends, Kubota. You would have to have a mounting plate fabricated, and there's a stud welded to a cylinder tube that's special. If it would help you in your quest for parts, I can post some measurements of cylinder lengths, what not. Maybe I could scan and post the instructions that came with the kit? I guess I could mail a copy to anyone who needed it, assuming 25 guys don't ask for them.