It's very simple. I would take a few pictures for you right now, because I have the car right outside and no engine in the way, BUT some dumb person spilled a drink on my digital camera and now it doesn't work. So, I'll explain. There are two brackets that hold down the steering rack. Jack the car up, throw some stands under it, and take the 12mm bolts off. On each side, there is one bolt that can be plainly seen and one that you have to go through the crossmember to get at. Once the bolts are off, take the brackets off, lift up on the steering rack and remove the old worn rubber. Then replace those with the new ones. Like I said, simple . Oh, about those 12mm bolts, for some reason on my 240Z, there was nuts on top of the captured nuts on my brackets. So, it was like someone put the bracket on, then to be safe, put some nuts on top of the brackets, like a jam nut.
So to simplify, remove the brackets, take out old bushings, install new ones.
(Uhg... I had too much coffee this morning and it hasn't worn off yet )
!M!