I have both model pumps and have owned the model 10 for more than 20 years. Both pumps have two holes, one on each side of the light fixture that extends out the front panel under the shade. Neither pump has the electrical manifold installed and I'm trying to figure out what the holes were for. I'm guessing they were used to hold a bracket in place that was used to assist in securing the electric manifold in place but I'm not sure. If some one could tell what the holes were for, and better yet, post a picture from inside the pump I would greatly appreciate it.