I have dismantled 7 steering racks, got plenty of spare parts, but I have absolutely no idea what part you call the bushing.
As far as I recall, the only moving part is the ball joint.
Please explain so we can help.
To undo the huge nuts on the end of the rack, you have to use heat to break the Loctite, plus there should be bent over lock tabs holding the smaller lock nut in place. I had to use a huge adjustable spanner to undo those nuts.
Personally I would not do that in situ, as flame and fibreglass is not a good combination, as getting a huge spanner (wrench) in there may be tricky. Maybe an electric heat gun blowing very hot air might work, but I would not guarantee that would be hot enough to melt the Loctite.