Sierra 18-5159 Mercury Ignition CoilSierra replacement ignition coil for Mercury Outboards, Mercury Race Outboards, Mercury Race Stern Drives, and Mercury Sport Jet engines. High quality brass secondary post for superior corrosion protection; Quality heatsinks for superb heat dissipation; Meets or Exceeds OEM standards; Interchangeable with: CDI; 184-0003; Mercury Marine; 300-8M0077471; 339-879984A1; 339-879984T00; Mercury Race Outboard; 300-879984T01; 339-879984A1; Mercury Race Sterndrive; 300-879984T01; 339-879984T00; Mercury Sport Jet; 300-879984T01; 339-879984T00;