^^^ agreed, if the parts house "box" reg does not have the easily visible wire wound resistors on the bottom side of it then it is an electronic version which is vastly superior to the old electromechanical (OE) types. If you have a 2 field terminal alt which you would have to have to be swapping in the later "flat" reg with the triangle connector then just ground one of the male alt field terminals to the nearby alt case (or rework the brush holder to ground it for a more aesthetic appearance).