Connector for neutral safety

Standard Ignition is enormous -- a very long established brand. Call around to various parts stores (real ones like CarQuest or Big-A, not Davey Do-It Yerselfer places like Autozone, Checker/Schucks/Kragens, and Pep Boys) and see who handles Standard Ignition in your area.

Or go back to NAPA for an Echlin EC187.