I thought that I'd post this since I had a dickens of a time getting the correct Pertronix Ignitor for my non-USA distripbutor. The part number that I needed to have is 1661. The box says it's for a 6 cyl Nippondenso dizzy. I hope that this helps someone in the future. It could have saved me a ton of frustration.
Best Regards,
Best Regards,