It really is simple,
The track rod ends basicaly are the bit between the hub assembly and the steering rack.
They have a pivit system on them and these can wear causing really bad feel for the road.
They are not expensive at all.
I would suggest changing these at the same time as lowering the car, makes a substantial differnce.
Both side cost £14
They are the same across the 306 range
Welly has attached the following image:
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