Question on V belts

debating whether to replace my old alternator belts. A few cracks but people tell me there is still some life left. They are Goodyear Matchmaker 13661 belts and my understanding is they have to be replaced as a matched pair. Is that right? Cause Ebay has ONE for sale for $7.89 but I don't know how old it is and I don't think I should replace just one. Goodyear says they stopped making V belts years ago. Cross matched Gates belt is $42 for one (not a matched pair). Should I try NAPA? Any...

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Author: spstan