I have been thinking about these connectors all day. I realized the terminals may have been used on the back side of power window switches through the '80s. A few searches located an easily purchased replacement connector PT546 / 12125634.
Further searching lead to this page:
https://t-h-e-door.blogspot.com/2019...door-lock.html
Which clearly shows the terminal you are searching for:
This page really is just a series of images of related parts and links, but they also have this information below one of the pictures of a terminal:
Pico 5846pt 16 14 Awg Gm Power Window And Door Locks
Searching for Pico 5846PT finds an amazon page with the product:
https://www.amazon.com/Pico-5846pt-G...ews/B004BT8GJI
And the discontinued GM number 2965880. Searching for the discontinued number finds this great page which shows multiple versions of the correct terminals depending on wire gauge along with a note for 5310 housing and used in ford fuel tank sending unit.
http://www.qualitydist.net/piunoelte.html
A quick search located the 2021 Pico catalog:
http://www.picowiring.com/catalog.html
And the universal and GM connectors and terminals section in PDF:
http://www.picowiring.com/pdf/Cat-45.pdf
Which shows a connector that appears to be the single connector for the Pico terminals above:
Ultimately I am sure if these will not work you will find something in the Pico catalog to fit the bill.