Where can I buy a replacement?

I can't seem to find a replacement cup for these headphones. Where would you buy them if you had to fix them?

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@oswaldoicaza all you can really do is to either try some 3D printing or keep an eye out for a broken headset to harvest parts from that. Ebay.com as well as places that sell used parts. Swap meets, flea markets and/or pawnshops can be a good resource.

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