Citroen C2 worn bushes

[_rubinho_]

My GF's Citroen C2 has got very squeaky front left suspension pointing to worn bushes. On these cars, can the bushes be changed or are they an integral part of the lower suspension arm meaning the whole lot needs replacing? Any good places to get the parts other than Citroen dealers? Easy DIY job or is it best to get a garage to do it?

Cheers!