Leaking power steering box - NEED Help

To replace the upper seal in the car I pull the steering column all the way out.
When the parts are severly worn, replacing the seal only slows the leak.

Thanks for responce RF, Yea i think the rest of it is ok. from what i could tell with the little bit of driving i have done with it. So it is just one seal?
I already have column out, and ready to do this. Lol