Glad the Niles hooked you up. I missed this thread originally, but I would have been willing to ship you some Phoenix connectors as they are actually a VERY common type of connector for equipment.
While those looked like they were spring loaded, typically they are screw down terminations. (see pic below) I can't really name all the places that I've seen them, but I know Sherbourn, Extron, Crestron, AMX, Polycom, Tandberg, ClearOne, and just a LONG line of other professional companies use Phoenix connectors for all their audio and control connectivity.
The hard part is that Phoenix Connectors are made in about a billion differrent sizes...