Laser Iridium NGK spark plugs The NGK 6774 (IZFR6K-13) Laser Iridium spark plug is primarily designed for Honda vehicles, featuring a 1.5L or 2.4L engine, including the Honda Fit (2007–2014), Honda Accord (2003–2007), Honda Civic (2008–2016), and Honda CR-Z (2012–2025).