Any wall mount that's VESA compliant will work with it. VESA is a standard mounting hole pattern, either 75mm x 75mm or 100mm x 100mm. This insures that
any VESA-compatible monitor will bolt onto
any VESA-compatible arm. The 1901 has the 100mm VESA hole pattern on it so any 100mm VESA wall mount will work fine with it.
Here's some links to places that sell monitor mounts:
Here
and
here
I'm sure there's even more info there about this "VESA" stuff.