This comes with a pair of 3mm LEDs into a single connector, it is very useful to put on the roof, side skirts and also in turn signals or the position lights, especially in models (Knight Hauler, Cascadia, Man and Mercedes Benz Actros, which are located at the lighthouse and on the side (in the engine side body or fender, respectively).
Note: the others do not have this option if you want to put it, you should rework!
Worth it, because you will have more options to put many additional options connectors lights on the MFC.