OFFROAD to 5-Pin Adapter (For Headset Direct Cables) – Rugged Radios
Amazon.com: Fancasee (2 Pack 6 ft Replacement 3.5mm Male Plug to Bare Wire Open End TRRS 4 Pole Stereo 1/8" 3.5mm Plug Jack Connector Audio Cable for Headphone Headset Earphone Microphone Cable
How to Hack a Headphone Jack
Amazon.com: Retevis Earpiece Adapter,2 Pin to 3.5mm Walkie Talkies Headset Adapter Only Compatible RT21 RT22 RT27 RT7 H-777 H777S RT18 RT19 RT22S (Not Fit for Other Brands) 2 Way Radios (1 Pack) :
How to repair fix handsfree headset earphone jack pin speaker not working - YouTube
Samson SWZ0DC400SB Replacement Cable for SE10 or SE50