OEM will be the kit but aftermarket can be the plug, you just have to splice to make it work.
I have to ask thou, how did you break it? I assume you draged the rear and ripped it off. You may want to look into the plug relocation mod that puts it next to your license plate instead of dropping it down low like it is OEM.
I broke my wire harness as well, drug it while doing some easy wheeling.
The dealer wanted over $100 to replace the whole unit, but I only needed the plastic plug.
I went to wallyworld and bought a cheap receptacle and spiced it into the original wiring.
I also did the relocation to the bumper mod, I should have done it sooner!