They're like umm.. the rubbery stuff that's wrapped around the umm joint of
the lower A-arm on the suspension.

Pretty easy to replace, although I found the anti-roll bar on my GTV made
things difficult.

Buy new A-arms from ebspares.co.uk ('cause the bush is part of the arm).

Apparently you can get some aftermarket ones.. Pro flex or something, where
you can just replace the bush itself if it wears again.

The achilles heel of the 156. Simple bits of rubber that are allegedly
difficult to replace. On the front suspension, worn bushes will create nasty
squeaky crunching noises especially in dry weather. Eventually it gets loud
enough for pedestrians to hear it. The normal fix is to replace the upper
wishbone arms. At the back, worn bushes result in a wallowy rear suspension
with a nasty sideways movement. Again, the usual fix is to replace the rear
arms which is apparently a more straightforward job than the front ones. If
there is no noise and the car handles ok, leave them alone. They expire
naturally after about 40K miles and will fail an MOT anyway. :-)

Phil 156 V6 1998