It appears that everyone is considerably over-estimating the SIZE of that connector. If the original photo cited by @Red Squirrel is accurate, that connector is perhaps 1/4 or maybe 1/3 the size of an XLR (or those old threaded-ring) connectors. It looks like that connector is 1cm or smaller in diameter. It is nothing like a mini-XLR connector either, as the pin diameter and location are quite different. It is in the genre of those proprietary power/charging connectors seen on some notebook computers, docking stations, etc. I have very low expectations that the connectors the OP ordered will be even remotely compatible.