Brian, the only way to find the parts you need is to find a junked tractor with them, or fabricate something to perform the same function yourself.
I've done some more looking at the 340's hydraulic system. There appears to be two different types. One is engine-driven with the pump and lines on the side of the engine. The other is transmission driven with the pump inside the tractor itself.
On the transmission-driven setup, a hose comes out one side of the tractor and goes up to the valve bank. Another hose comes out of the valve bank and goes back into the side of the tractor.
One of these hoses is pressure. If you can figure out which one, you could re-route that hose to a generic 2-spool open-center hydraulic valve with power beyond, then back into the tractor's valve bank.
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