Does anyone in Western Canada know a place to source the Hydraforce valve that wont take 2-3 months?
Best place I know for hydraulic stuff is Gt Hydraulic in Stettler Ab. If you have a part number phone and ask for Greg the owner, he will look it up for you.
For closed center you can also look for this mounting, click on picture in first post, there are numbers on the components.
If you are able to find the parts, this will give you better performance especially if you are not on a dedicated steering circuit since it as is own pressure regulator.
Here the schematic for an closed center setup.