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Hi, my name is***** suspension struts and air springs can be replaced on an individual basis. There is no need to replace any struts or springs that are not leaking. Having said that, if all but one is leaking and the last one has never been replaced it may be a good idea to replace it now as it will most likely fail sooner than later. If you would rather save the money and replace only what is leaking there is absolutely nothing wrong with doing so.
Let me know if you have any questions.