Which woofers will replace BD5806 woofers from (MW5806) speakers?

I have a pair of MW5806 speakers. I need replacements woofers but Polk tells me the woofers BD5806 are no longer made and they can't cross reference the specs to tell me which woofers I can replace them with. Does anyone know which model woofers I can buy that will fit and have similar specs to the BD5806?

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