I can find them on Amazon and eBay, but not on Digikey. Here they are:
The ebay link has a gigantic compatibility list so they seem to be widely used. Are they available on DigiKey? I searched for quite a while and couldn’t find them.
If DigiKey had these connectors, they would fall into the Terminals > Housings, Boots category.
That category would be were you find housings for Quick Connect type terminals that are often found in motorcycle/offroad applications.
I didn’t see a visual match to the connector kit example you have.