'23 T bucket ?
When you are out looking for a Corvair steering box, look for a '60 to '64 model. Like I said before, they are alum and polish up nicely. The other nice thing about them is that they have a coupling just up the column shaft from the box. This makes it a lot easier to remove them because the box comes out the bottom and the column comes out from the top in one piece. If you need to use a u-joint in the column when you're installing the steering, those splines will be handy.
The '65 on up is a cast box that has a one piece column shaft. You have to pull the steering wheel and pull the box with the shaft out the bottom of the car. Kind of a ***** when the car is sitting on the ground.
I haven't seen any Corvairs in the yard with boxes in them for a couple of years, The last 2 I used came off of e-bay. If you go this way, don't get one that's reversed. It's real easy to do yourself. No need to pay to have someone else to do it.