Nope, the "trolley" or how do you say it, over the bush doesn't come off. It looks like it's pressed around the bush and the ARB. I'm wondering if they mount the new bush with a new holder but I think you can't recuperate the holder for the new bush.
I've also heard that there is no seperate OEM part for an original bush but completely with the ARB.
I don't know how others has fixed this issue in the past.