stem for elgin watch

[acgt101]

hello, I'm looking to try repairing a pocket watch movement, but I've run into an issue, I have no idea how to find the correct stem for the movements I'm looking at, which don't include stems. I'm looking at two Elgin movements, the grade 152 and grade 312. thanks in advance for your help.

[xyzzy]

The stem is part of the case rather than the movement with this kind of pocket watch.  Any size 16 hunter case would have a stem that should work.