LS90 drivers

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I inherited a pair ls90s that my parents bought new in the 1990s. One of the drivers is scratchy sounding
I flipped it 180 and it helped but was looking for a replacement
Calling Polk c/s the nice lady in what sounded like India told me they were discontinued. I am seeing there is someone on eBay selling “compatible” replacements but I don’t know if I trust that. Any recommendations on what to do next?

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