umm popping out the old busching will be a chore that much I can tell you.
Best way is to use penetrating solvent and a vise or a big socket (the size of the outer race) and hammer and start pounding until she comes out, just don't do only one side of the race otherwise it will jam.
Have fun, and oh yeah, Energy Suspension does make some bushings for our arms, except you have to mod it, as in cut it down to size, but it will fit. I will dig through my reciepts to see if I can get a part number for you.