As Skipper said you can get all the parts he listed from a salvage yard but expect to paid $800/$1000. Jackson makes a power steering add on but it's not cheap either. Google Jackson power steering and it should come up.
A better option might be to look for a cheap non runner with maybe a bad trans or engine with PS and possible good tires. This way it will solve your tire issue also.
I picked up a running select-o-speed with bad tranny with power steering and fair tires for $400 this spring. It might be a lot cheaper to get a ran when parked and switch over the parts you need than send the non runner tractor down the road for maybe what you paid for it.
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