So can you buy the bushes separately from Ford or are you talking about aftermarket ones that are available?
Like I say, the problem with the independent rear suspension setup Ford have tended to use on their more recent vehicles isn't necessarily that it's terribly complex to dismantle and reassemble (though some of them have rear track adjustment so you have to be a bit careful) but that the bolts that pass through some of the various bushes that hold it all together seize into the bushes themselves so that when you attempt to remove the bolt you just end end rotating the bolt with the remains of the bush and you can't get the bolt out without resorting to cutting it! There is a chance that Ford have changed their production practices and started greasing the bolts on assembly or just using better grade materials which will make the job much easier, but I have my doubts! I have worked on a few older Fords with a similar rear suspension setup and rarely was it a straightforward job when it came to trying to dismantle it all, it certainly wasn't a technicians favourite job!