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I've not seen one in person. What I can find from searching looks like it might be a packard wire?
Reaching out to a company like "lectric limited" could be fruitful.
In some cases, I'll replace harnesses like this with a more modern setup like weatherpack. More reliable and easier to connect/disconnect than some. The only risk is it'll make it harder for someone doing the job by the book to find the wire.
There were different series used through the years. Also, Delphi/Packard is now Aptiv.
If you can match the housing, you can match the connector. Four pages to go through of single wire housings, scroll down linked page to view housings. Some are still available some are not.
Mouser Electronics-Aptiv Link: https://www.mouser.com/Aptiv/Connect...z0x9zoZ1yvsm2b
Some Housings/Connectors have data sheets you can view. One example of a single wire series Metri-Pack 800 housing, GM #12160893: https://www.mouser.com/datasheet/2/1...93-1162027.pdf
Actually you don't need new connectors as the contacts are easily replaceable (you use a flat blade "jeweler's" screwdriver. You just need contacts (easy to get). Crimping them anywhere near properly is difficult without even the cheap hand tool but it can be done. If you don't have the professional type crimp tool (they're very expensive) you should do you best to crimp and then solder.