I have two coils here for the Briggs 5HP engines. Both are supposed to be armature coils, meaning no points needed. One has a metal leg to sense the magnet and the other does not. Can someone help me understand why? I was told that the coil without the metal leg is the hotter coil for the later Raptors, but without part numbers on them, I have no clue! The coil with the metal leg is red on the side. Please help me!