This is how I removed the rear bushes from my 2001 Seicento sporting, but this will work for any cento.

There is already a great guide on here showing how to remove the rear arms, so I'll skip this part, although its only 3 big bolts to remove, a handbrake cable and break pipe to remove.

You will need:
  • 1 bolt
  • Hub puller
  • Hacksaw
Once the arm is off the car
Stick a bolt through the center part of the bush,
Then place the hub puller just under the rubber flap of the old bush with the screw on the bolt.
Keep turning until the rubber part of the bush has popped out
Then disassemble the hacksaw and re-assemble with the blade through the center
You can now cut the old metal sleeve away ready for the new bush.(y)