ARB Bushes

[WiNgNuTz]

Simple question really, are these one of those things that should really be replaced in pairs? And is it a fairly simple job? Only asking, as it only seems to be the passenger side thats knocking, and this saturday is when they'll be changed, but also got to lower the torsion bar as well within the day, and ive not done it before, so should be a bit of a challenge!