that's the reference of the bush
52385-ST3-G01
mine where too old as you can see in the picture....
forum/viewtopic.php?p=155166#155166
In a first time you have to put your wheel off of your car.
put the caliper off and the same thing for all the screw which maintain the rear arm.
take care about the crew which is "doing" the parralelism.... but if nobody touch it before, you must have the frame in the blaxon...
so, with this method you don't have to change your brake fluid or something else.
Use a hammer or a mallet(hammer with rubber) to put the old one off.
u can put the rubber off of the old bush to use it to put the new one on the rear arm. I'll most easy to put off the old one thant put in the new one
when you have implement the new one, you can put the rear arm on the car
don't forgot any screw
and don't forgot to work with the work shop in the way to know how to tight it 
I think that i've say all I can say
If you have any question don't hesitate !
I hope that you can understand my english
if there is something to correct tell me 
Enjoy'
