The replacements I helped a buddy with included new bushings and inner sleeves. (poly). We had to get the rubber out and leave the old pressed in cages.
A simple propane torch got the rubber burning. I let it burn until it expanded up and pressed it out the back side with an old screwdriver. Then we scorched the rest of the remaining rubber off the sleeves, allowed to cool and reassembled.
Now, if you get a different type than what he had, you may have to do this process differently. But it's the same way I get the rubber out of the rear springs.
Dave