Oh it's a rack and pinion?!
Take the end cover off where the hoses go in and you will find the valve in one of the casting projections. Most of these are aluminum so the bore is probably corroded, a little scotchbrite and you might be good to go?
Worth a try and you don't have to switch racks, you might even be able to just change housings with a good junkyard piece.
Don't give up yet!
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”
— Han Solo