I need a rear hub for a project I'm working on. Only thing it has to be is disk brake and 15mm axle.
If it's on an old rim, that's fine too - I can remove it.
KX65 Rear wheel would work for you. Disc brake and 12mm axle.
Also, T-Bolt has reduction spacers to go from 15mm to 12mm, if you find a china hub. (most are 15)