jiffipopAs it was explained to me, the Shure/Campfire MMCX fits majority of the MMCX IEMs whereas the Westone MMCX connector has a special fitment that's unique to Westone. You would like more than likely need the Shure/Campfire/etc MMCX version for your LZ
Edit: Per older comments from the thread: Westone does a weird inverse-recess thing on their MMCX connectors "for stability".
I have the LZ A4.