I am not the one who can answer that question ;-)

Hi Dave,
I have not changed these bushes yet, but in the past I worked on cars
and trucks which had bushes of similar type. those days we used to heat
up the tube that went through the middle of the bush where the bolt
goes through, then push it out of the bush. then we would place a
hacksaw blade through the hole, saw through the rubber bush till you
get to the metal outer case of the bush, saw through this just enough
without cutting into the wishbone body, the thickness of the saw cut
allows you to prise the old bush into a smaller diameter and tap or
press it out. To fit the new bushes if you place the wishbone into
boiling water till it is hot [this makes the metal swell] the new
bushes should enter much easier maybe using a vice to force home. [When
the metal cools it will tighten onto the bush. I have heard that the
poly bushes [from Powerflex] are much easier to fit and last longer.
Check out the Powerflex web site first.
John, UK.