Amazon.com: ANDTOBO 1/4'' to 3.5mm Stereo Pure Copper Headphone Adapter, 3.5mm(1/8'') Plug Male to 6.35mm (1/4'') Jack Female Stereo Adapter for Headphone, Amp Adapte, Black 2-Pack : Electronics
3.5mm 4 Position Headset Extension Cable - Audio Cables and Adapters | StarTech.com
JR8013/7M - Pro Signal - Audio / Video Cable Assembly, 3.5mm Stereo Jack Plug, 3.5mm Stereo Jack Plug