Db6501 woofer sent in for warranty

Hopefully someone can help. I sent in a db6501 woofer for my car into warranty for replacement and Polk sent me a mm6501 replacement. While I appreciate the upgrade it won't work with my existing equipment in my car since the impedance doesn't match. Can I get just get a replacement db6501 woofer or preferably an upgrade for all of my speakers to match the replacement woofer?