Amazon.com: USB Audio Adapter - VENTION USB External Stereo Sound Card to 3.5mm Headphone and Microphone Jack Adapter for Windows MAC Linux PC Laptop Desktops PS5 : Electronics
Icom OPC-589 Microphone Adaptor Cable – ATR
8 pin round to 8 pin modular (RJ45) microphone mike adapter Icom OPC-589 equiv | eBay
4 & 6m Ham Radio blog: ICOM Microphone adapter OPC-589 (clone by RNZ_LAB)