SephHaleyThese cables are cheaper than aftermarket ones. A2DC connectors are better than MMCX since all parts that can potentially be damaged are on the cable side. MMCX was not designed to swap cable constantly and can leave wear in your earphone as well.
Just get the 313. 323 is a special version that's hard to locate in Japan. I heard that 323 is changing characters of the headphone too much.