Yeah, they have a lifetime guarantee, but you still have to do the work to replace them.

I have seen joints in rebuilt axles fail while the boots are still intact.  I now avoid them because I don't like the idea of a joint failing without warning.  (normally, if the boot is intact, the joint is ok.  If the boot is ripped, its a warning that its time to clean and re-pack the joint)

Bill
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Rebuilt CVs are a generic parts store item. They may have to order them
for you and most list members don't rave about them but if they come with
a lifetime guarantee you just got to find out how much, how good that
guarantee is.