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6.35mm Replacement Cable Extension Cord for Sennheiser HD 518 558 569 579 599 598 CS Se HD518 HD558 HD569 HD579 HD599 Headphones - AliExpress
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Amazon.com: Geekria Audio Cable Compatible with Sennheiser HD 599 SE, HD 599, HD 598, HD 598 SE, HD598 CS, HD 598 SR, HD 560 S, HD 400 PRO, HD 579, HD 559
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Sennheiser Spare Connection Cable for HD 555/595 - Each
Sennheiser HD555 Bastard Soundstage Foam Mod : r/headphones