2815, 3403, 6703, 739 09052 112, 739 09052, F1000-420682-BOS, ICA65505, IGN01178, IGN01185, IWA69042, RBI6703, TR4GP, TR55GP, XP606. The fine wire design with a platinum firing pin on the center electrode and tapered ground electrode are an economical upgrade from conventional copper core spark plugs.