I am lucky to have the original date coded Yazaki plug and coil leads on my 1970 240Z. So I've started this topic to discuss the details of these on S30 cars, I don't want to limit this to only early cars, as I'm interested in hearing about their evolution over the years. Edit, 6AUG2021,  Replaced image and pdf drawing to reflect correct part numbers I have taken detailed measurements to create 3D cad models and a drawing complete with markings. To start here are a few pictures of mine