Electric brake connector for a Freightliner chassis

I am trying to install an electric brake controller in a 2013 DP on the Freightliner chassis. I have been told that it has a plug in on the steering column. I have spotted a round connector about 1.25" diameter screwed to the column that has five wires going to it, two green, a red, an orange, a yellow and a black. It appears to have 4 more empty ports but is hard to see clearly. Does anyone know a connector that will plug into this or if this is even the right one? The color codes for the wires would be nice too.