I saw this one too, but I'm not sure it would work on the uBitx, because the mic for the uBitx has only three connections on the plug rather than four.? I think the difference is that the uBitx mic is just a mic, and not a speaker-mic.?
Checked my mic for a part number, but couldn't find one.? Unfortunately, so far I've not found anything for sale that looks like it matches up.?
Might need to contact hfsignals.com or gigparts.com directly to see if one could be ordered.
Another option might be to order a Baofeng speaker mic and change the connector to a 3.5mm stereo plug,? or find/build a short cable to adapt it.
73 Rolan N8LOV