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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, they are not pristine but the date code and markings can be seen. Here are a few images of the 3D cad model, created with Solid Edge version 2020: The descriptions and part numbers are from the 1973 JDM S30 Nissan parts microfiche. Interestingly the lengths quoted in the parts book are close but not exactly the same as my examples. The small triangle ahead of Yazaki, is actually their corporate symbol, I did my best to represent it as close to the original as I could. The text font I used was the closet I could find on my cad program, again close but not exact. https://www.yazaki-group.com/75th_en/history/mark/ I'm also attaching a drawing of these in pdf format. @Mike, I hope you don't mind that I poached the club logo and used it. Any comments are welcome and appreciated. Here's a preview of sheet 1 of the drawing: 22450-E4125(A) Yazaki Ignition Lead Set 1970 240Z.pdf