Dave, your right, it is a 2" like Truk mentioned. Had a case of CRS. I did find out with the kit I have that you get FAR TOO much wire with it. Also with a 2" hole you have to plug the harness in with the plug already installed in the bed side. There is not enough room to plug the connector into the plug and push it through the 2" hole. My plug has a square plate on it that takes 4 screws to hold it to the bed side. I watched the video that Truk posted...no way was the plug and harness connected together going through a 2" hole, at least on my kit.
Dave, is the second plug for your mid-ship turn signals?? Bob