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3.5mm TRS Stereo Female to 1/8" TS Mono Male Audio Adapter Headphone Connector | eBay
3.5mm Stereo Jack Plug to 2.5mm Mono Socket Adapter Converter Xbox 360 Headphone 5055538198908 | eBay
3.5mm Mono Plug to 3.5mm Stereo Jack Audio Headphone Adapter
Mono-to-Stereo 3.5mm 2-Conductor to 3-Cond Adapter
Amazon.com: Monoprice 107128 3.5mm Mono Plug to 3.5mm Stereo Jack Adaptor, Gold Plated : Everything Else
Amazon.com: 3.5mm Stereo Male to Dual 3.5mm Mono Male Audio Cable, 1ft 3.5mm 1/8" TRS Male to 2 x 3.5mm 1/8" TS Male Y Breakout Cable Splitter Adapter for Headphone, Speaker :
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Gold Plated 3.5mm Male to 2.5mm Female Audio Headphone Adapter Headset Converter 3 Ring Jack Plug - Stereo or Mono (2-Pack) - Walmart.com
Livewire Essential Stereo 3.5mm Female TRS to Mono 1/4" Male TS Adapter Black | Guitar Center
Hosa GPM-179 Mini Stereo to Mono 1/4 inch Headphone Adapter | Sweetwater