Missing lower end parts on steering column?

I've dismantled the standard column from my 74 duster and I think there might be some missing parts. My repair manual and most other online info has told me there should be a lower bearing, which I don't have.
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Here I have loosely reassembled the steering shaft, shift tube, and outer unnamed tube, showing everything that was there, other than the coupler, before I had dismantled it.
From what I understand, there is supposed to be a bearing between the steering shaft and shifter tube. I feel that there is also something missing that goes between the shift tube and outer tube, a seal perhaps? The white bushing does not stay in place very well and could easily slide, which brings me to my next question. Where are the shift tube and bushing supposed to be in relation to the outer tube? I never concentrated too much on this while it was in the car, so I don't remember explicitly, but I think it was something like this:
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Or is it supposed to be closer to this arrangement:
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The bushing is right up against the end of the shifter tube here, and is visible through that slit on the outer tube.