Very happy with mine too - thanks Stot!
Regarding the original bushes, mine came out fairly easily.
I started off by drilling a load of holes in the rubber then pushed the centre bush and most of the rubber out.
I then set to work on the outer metal bushes with a hammer and screwdriver.
The outer bushes are in two halfs and the trick is to bend one half inwards along the join.
As soon as the two halfs of the metal bush aren't touching the pressure holding them in is released and they pretty much just pop out