DIY Audio Electronics from Zynsonix.com: Headphone Connectors & Pins / Pinouts for DIY
Silverback Flex Pin Connectors, For Spring-Loaded Inputs — Sewell Direct
Amazon.com: TNP Cable Adapter 5 Pin DIN Plug Male (180 Degree) to 3.5mm (1/8in) TRS Stereo Male Jack Cable Converter for Vintage Stereo Radio Audio Equipment Signal Output 3.5M - 5 DIN