Blender 3D model of the Stereo Plug Adapter. Dimensions: 10,3mm deep x 10,3mm wide x 45mm high.
You can find a video lesson on creating this model here: https://www.youtube.com/watch?v=RUPhlB_KkU8 This is not my channel, but respect for the author.
The model was created in Blender 2.80. Render engine - Cycles.
I will be glad to answer your questions. Good luck ;-)