I don't think any of the MM UTS tractors had power steering.
For Original steering gear (and front axle; it looks like yours is different):
Call Wendell Everett 740-922-3335. Gnadenhutten, Ohio. He's not there all the time, so keep trying until you get him. Probably the place you heard about, the salvage yard is on a dairy farm.
Also, Welters 417-498-6496 (MO) may be able to help with parts as well.
P.S: What runs the power steering? Is it plumbed into the regular hydraulics, or does it have the Chevy pump belted off the engine?