Actually, that is not the original. The original had the leads entering next to each other approximately 6mm apart. The one pictured above was after the change to bring the leads in at 180 degrees opposite each other. The thought process being to have the mass of the leads, such as it is, evenly distributed on the cone. With both leads on one side of the cone you have a greater mass on one side than the other. At least in theory. Response tests and burst tests showed little to no difference.
This is an original design.