Hi everyone, my mechanic friend and I are trying to service my 323 [1998, 1.3 16V petrol, 3-door hatchback] and he's pointed out a couple of parts that I should order for him to install. I'm having a tricky time finding the parts numbers for the parts labelled 3, 4, and with the red box on the image I've uploaded here.

The part in the red box is some sort of rubber bushing that's cracked.

- Does anyone know the parts numbers for 3, 4, and red box?
- Another friend has suggested that I actually don't have to replace parts 3 and 4 and that removing the rust should be all that's needed. Any ideas there are also appreciated!
- I have a bit of rattling when I do tight turns; could this be the trailing arm? It seems to be seated with quite a lot of space between it and the chassis.

Thanks in advance for your help. If anyone wants the manual I took this image from, let me know.