GEEKRIA Audio Cable Compatible with Sennheiser Game One, Game Zero, PC 373D, GSP 500, GSP 600 Headphones, Dual 3.5mm Y Splitter Adapter to 2.5mm Replacement Stereo Cord (5.6ft/1.7m)

Hi! Sorry for the late reply. Have you found a cable yet? If not, any of these should work: https://www.amazon.com/Zosvoses-GSP-600-Compatible-Sennheiser/dp/B0FHQ981DD https://www.amazon.com/Compatible-Sennheiser-Headphones-Splitter-Replacement/dp/B0D4LMP8D6?th=1 There aren't many options available on Amazon, but you'll likely find hundreds more on sites like AliExpress. I know you're looking for quality, but cables that use this proprietary connector generally aren't made by "established" brands anymore. Most of what's available comes from no-name manufacturers producing them in bulk. That said, I can almost guarantee you won't notice any difference in audio quality between them. The main difference is usually the build quality. As long as you treat the cable like any other wire and don't abuse it, it should work just fine. If you do end up purchasing one other than what I've linked, just ensure that you purchase one that has the MIC (pink) 3.5mm AND the AUDIO (green) 3.5mm jack