Hill Country Customs Brake Stop Light Switch for 1990-2003 Harley-Davidson Models - HC72191 New brake light switch for most 1990-2003 Harley-Davidson models. The mounting nut is 7/8" If your brake light switch is surrounded by a shield, then it needs to have a 1" diameter opening in order for this switch to fit correctly. This replaces HD # 72023-51A.