Hi all, my first post here so apologises if this sounds a bit stupid..........
I have noticed a knocking sound from the offside rear of my '99 1.4 focus so I decided to jack it up and have a look. I have a bit of a problem with the front bush on the trailing arm! My question is........which is the best fix for this? replace only the bush or to replace the whole arm? I have reasonable mechanic skills but am in no way an expert (hence posting this question! lol). I was going to post a picture but am not sure if I can (being a newbie) or even how to

Any help advice on this would be great as I am planning to try and sort this at the weekend