Balance 310 DC Connector

I have a Balance 310 5G.

I want to provide DC power to the Balance from a 13.9v power supply, but cannot find a source for the DC connector.

Pep Wave can sell me a replacement power cube and tells me to cut and splice the wire.

Question for the Community: Can anyone provide a link for a third party source of the Balance 310 5G DC connector?

Alan