I had the same problem finding those connectors for my TIG torch.
Searching for 'XS12' at AliExpress.com I found compatible connectors BUT with the pins in the chassis mount end, and sockets in the cable end. It turns out that the pins and insulating bushing is held into the connector body by a small circlip, and can be installed into either metal housings.
Most places sell the plug and socket as a pair, so pop out the circlips, swap the insulating bush/pin assembly, and re-insert the circlip.
Before you re-assemble, check for metal burs in the plug housing, and file off as necessary. In my case, the burs rubbed on the plastic bush on the welder chassis socket, making it a tight fit.
Be careful with the two pin connectors. Some sell 2 pin connectors using diagonal holes of a four pin insulator resulting in the pins at 45 degrees to the keyway, whereas others have a special 2 pins insert with pins perpendicular to the keyway.