Do you need to change the whole unit? on 2010 Buick Enclave

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Do you need to change the whole unit if your struts are still good and not leaking but the mount is causing a knocking noise on bumpy roads? Why can't you change only the mount and keep the struts you have?
(1) Answer
I see no reason it can't be done that way.... If that's what you want!!... It's your vehicle and money after all....