You might try an electrical supply if you have one that sells retail. I doubt Home Depot, Lowes, etc have them
You want "uninsulated" butt splices.
But I often "make" them.
I often take a "common" plastic insulated splice. With the eyelets, most of the time you can grip the eye with pliers, grab the plastic with needle nose, and twist the plastic right off
There are three common types for automotive. There are larger and smaller than these
"Standard" is red, blue, and yellow. You want yellow for that splice which is "up to" no 10 wire