Take Five Audio has various DIN parts, junction boxes and complete cables.
https://www.takefiveaudio.com/shopdisplayproducts.asp?Search=Yes&sppp=15&page=1&Keyword=...=
I have zero personal experience with their DIN products, but here they are for research.
DeKay
https://www.takefiveaudio.com/shopdisplayproducts.asp?Search=Yes&sppp=15&page=1&Keyword=...=
I have zero personal experience with their DIN products, but here they are for research.
DeKay