You will need a total of 4 bushes, 2 for each trailing arm
E Brake= Emergency Brake = Handbrake = parking brake!
Because your going from Drum brakes to disk brakes the handbrake cable maybe slightly different,especially at the brake end.
I can take a picture of CSi handbrake cables for you so you can compare with the ones from the CS set up - let me know
Assume you have all bits and pieces for the CSi braking system