Where to get a replacement driver woofer 6.5, for t50 polk?

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Hello,
I'm new here. I have 2, T50 tower speakers, and the 6.5 woofer quit working. The only numbers on the woofer are T50 WF, and 18 01 17. I googled that and came up with nothing. No other numbers or anything on them.

They are powered by an onkyo TX-SR373 receiver. This is the 2nd time it quit. The first time best buy gave me a new tower. Any reason why it blew? I do not blast this really loud.

Will any 6.5 woofer work in those towers? Anyone know any replacement part number or anything?

Thanks for your help

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