NGK Spark Plugs (U.S.A.), Inc. is the largest OE supplier and manufacturer of spark plugs for domestic and import vehicles in North America. Its OE legacy, unsurpassed quality and leading vehicles in operation coverage reinforces NGK as The Ignition Specialist™. With over 80 years of automotive expertise NGK has built a reputation for quality and reliability, manufacturing spark plugs for virtually every automotive, motorcycle, marine and small engine application. We are committed to be the premier partner with our customers, while maintaining original equipment standards for the highest durability and operational performance. With state-of-the-art manufacturing, inventory and distribution facilities in North America and across the globe, NGK is dedicated to providing customers with world-class products and services.
| Year | Make | Model | Submodel |
| 2008-2009 | American IronHorse | Bandera | Base |
| 2008 | American IronHorse | Classic Chop | Base |
| 2009 | American IronHorse | Judge | Base |
| 2004-2007 | American IronHorse | Legend | Base |
| 2005-2007 | American IronHorse | LSC | Base |
| 2004-2007 | American IronHorse | Outlaw | Base |
| 2004-2005,2007-2009 | American IronHorse | Slammer | Base |
| 2004 | American IronHorse | Stalker | Base |
| 2004-2007 | American IronHorse | Tejas | Base |
| 2004-2009 | American IronHorse | Texas Chopper | Base |
| 2002 | Arctic Cat | 4-Stroke Touring | Base |
| 2002 | Arctic Cat | 4-Stroke Trail | Base |
| 2001-2004 | Big Dog | Boxer | Base |
| 2001-2005,2007,2010-2011 | Big Dog | Bulldog | Base |
| 2003-2004,2006-2007 | Big Dog | Chopper | Base |
| 2005 | Big Dog | Chopper BDM | Base |
| 2003-2005 | Big Dog | Chopper DT | Base |
| 2005 | Big Dog | Chopper RT | Base |
| 2009-2011 | Big Dog | Coyote | Base |
| 2001-2003 | Big Dog | Husky | Base |
| 2006-2011 | Big Dog | K-9 | Base |
| 2010-2011 | Big Dog | K-9 EFI | Base |
| 2001-2011 | Big Dog | Mastiff | Base |
| 2010-2011 | Big Dog | Mastiff EFI | Base |
| 2008 | Big Dog | Mutt | Base |
| 2001-2011 | Big Dog | Pitbull | Base |
| 2001-2002 | Big Dog | Pro Sport | Base |
| 2004-2006,2008-2011 | Big Dog | Ridgeback | Base |
| 2001 | Big Dog | Vintage Sport | Base |
| 2001-2002,2010-2011 | Big Dog | Wolf | Base |
| 2003-2004 | BMW | K1200GT | Base |
| 1999-2009 | BMW | K1200LT | Base |
| 2003 | BMW | K1200LT Exodus | Base |
| 1999-2002 | BMW | K1200LTC | Base |
| 1999-2001 | BMW | K1200LTI Icon | Base |
| 1999-2000 | BMW | K1200LTS | Base |
| 1997-2000 | BMW | K1200RS | Base |
| 1999 | BMW | K1200RS Dakar | Base |
| 1987-1988 | Buell | RR1000 | Base |
| 1989-1990 | Buell | RR1200 | Base |
| 1989-1993 | Buell | RS1200 | Base |
| 1992-1993 | Buell | RSS1200 | Base |
| 1998 | Buell | S1 White Lightning | Base |
| 1995-1996 | Buell | S2 Thunderbolt | Base |
| 1996 | Buell | S2T Thunderbolt | Base |
| 2002 | Buell | X1W White Lightning | Base |
| 2013-2015 | Chevrolet | Spark | LS |
| 2013-2015 | Chevrolet | Spark | LT |
| 2015-2016,2018 | Cub Cadet | Challenger 700 | Base |
| 2017-2018 | Cub Cadet | Challenger 750 | Base |
| 2017 | Cub Cadet | Challenger 750 Camo | Base |
| 2016-2018 | Cub Cadet | Challenger 750 Crew | Base |
| 2017-2018 | Cub Cadet | Challenger 750 EPS | Base |
| 2016 | Fiat | 500 | c Easy |
| 2014-2017 | Fiat | 500 | c Lounge |
| 2014-2017 | Fiat | 500 | c Pop |
| 2016 | Fiat | 500 | Easy |
| 2014-2017 | Fiat | 500 | Lounge |
| 2014-2017 | Fiat | 500 | Pop |
| 2014-2016 | Fiat | 500 | Sport |
| 2012-2016 | Harley Davidson | FLD Switchback | Base |
| 2000-2016 | Harley Davidson | FLHR Road King | Base |
| 2007-2013 | Harley Davidson | FLHRC Road King Classic | Base |
| 2002-2006 | Harley Davidson | FLHRCI Road King Classic | Base |
| 2000-2006 | Harley Davidson | FLHRI Road King | Base |
| 2004-2007 | Harley Davidson | FLHRS Road King Custom | Base |
| 2007 | Harley Davidson | FLHRSE3 Screamin Eagle Road King | Base |
| 2008 | Harley Davidson | FLHRSE4 Screamin Eagle Road King | Base |
| 2013 | Harley Davidson | FLHRSE5 CVO Road King | Base |
| 2002 | Harley Davidson | FLHRSEI Screamin Eagle Road King | Base |
| 2003 | Harley Davidson | FLHRSEI2 Screamin Eagle Road King 2 | Base |
| 2004-2006 | Harley Davidson | FLHRSI Road King Custom | Base |
| 2000-2009 | Harley Davidson | FLHT Electra Glide Standard | Base |
| 2000-2005,2007-2013 | Harley Davidson | FLHTC Electra Glide Classic | Base |
| 2000-2006 | Harley Davidson | FLHTCI Electra Glide Classic | Base |
| 2004 | Harley Davidson | FLHTCSE Screamin Eagle Electra Glide | Base |
| 2005 | Harley Davidson | FLHTCSE2 Screamin Eagle Electra Glide 2 | Base |
| 2007-2016 | Harley Davidson | FLHTCU Electra Glide Ultra Classic | Base |
| 2000-2006 | Harley Davidson | FLHTCUI Electra Glide Ultra Classic | Base |
| 2015-2016 | Harley Davidson | FLHTCUL Electra Glide Ultra Classic Low | Base |
| 2006 | Harley Davidson | FLHTCUSE Screamin Eagle Ultra Classic Electra Glide | Base |
| 2007 | Harley Davidson | FLHTCUSE2 Screamin Eagle Ultra Classic Electra Glide | Base |
| 2008 | Harley Davidson | FLHTCUSE3 Screamin Eagle Ultra Classic Electra Glide | Base |
| 2009 | Harley Davidson | FLHTCUSE4 CVO Ultra Classic Electra Glide | Base |
| 2010 | Harley Davidson | FLHTCUSE5 CVO Ultra Classic Electra Glide | Base |
| 2011 | Harley Davidson | FLHTCUSE6 CVO Ultra Classic Electra Glide | Base |
| 2012 | Harley Davidson | FLHTCUSE7 CVO Ultra Classic Electra Glide | Base |
| 2013 | Harley Davidson | FLHTCUSE8 CVO Ultra Classic Electra Glide | Base |
| 2014-2016 | Harley Davidson | FLHTCUTG Tri Glide Ultra | Base |
| 2009-2013 | Harley Davidson | FLHTCUTG Tri Glide Ultra Classic | Base |
| 2003-2006 | Harley Davidson | FLHTI Electra Glide Standard | Base |
| 2010-2014 | Harley Davidson | FLHTK Electra Glide Ultra Limited | Base |
| 2015-2016 | Harley Davidson | FLHTK Ultra Limited | Base |
| 2015-2016 | Harley Davidson | FLHTKL Ultra Limited Low | Base |
| 2014-2016 | Harley Davidson | FLHTKSE CVO Limited | Base |
| 2006-2016 | Harley Davidson | FLHX Street Glide | Base |
| 2006 | Harley Davidson | FLHXI Street Glide | Base |
| 2014-2016 | Harley Davidson | FLHXS Street Glide Special | Base |
| 2010,2015-2016 | Harley Davidson | FLHXSE CVO Street Glide | Base |
| 2011 | Harley Davidson | FLHXSE2 CVO Street Glide | Base |
| 2012 | Harley Davidson | FLHXSE3 CVO Street Glide | Base |
| 2010-2011 | Harley Davidson | FLHXXX Street Glide Trike | Base |
| 2015-2016 | Harley Davidson | FLRT Freewheeler | Base |
| 2012-2017 | Harley Davidson | FLS Softail Slim | Base |
| 2016-2017 | Harley Davidson | FLSS Softail Slim S | Base |
| 2006 | Harley Davidson | FLST Heritage Softail | Base |
| 2000-2017 | Harley Davidson | FLSTC Heritage Softail Classic | Base |
| 2001-2006 | Harley Davidson | FLSTCI Heritage Softail Classic | Base |
| 2000-2017 | Harley Davidson | FLSTF Fat Boy | Base |
| 2010-2016 | Harley Davidson | FLSTFB Fat Boy Lo | Base |
| 2016-2017 | Harley Davidson | FLSTFBS Fat Boy S | Base |
| 2001-2006 | Harley Davidson | FLSTFI Fat Boy | Base |
| 2005 | Harley Davidson | FLSTFSE Screamin Eagle Fat Boy | Base |
| 2006 | Harley Davidson | FLSTFSE2 Screamin Eagle Fat Boy | Base |
| 2006 | Harley Davidson | FLSTI Heritage Softail | Base |
| 2005-2017 | Harley Davidson | FLSTN Softail Deluxe | Base |
| 2005-2006 | Harley Davidson | FLSTNI Softail Deluxe | Base |
| 2014-2015 | Harley Davidson | FLSTNSE CVO Softail Deluxe | Base |
| 2000-2003 | Harley Davidson | FLSTS Heritage Springer | Base |
| 2008-2011 | Harley Davidson | FLSTSB Cross Bones | Base |
| 2005-2007 | Harley Davidson | FLSTSC Softail Springer Classic | Base |
| 2005-2006 | Harley Davidson | FLSTSCI Softail Springer Classic | Base |
| 2010 | Harley Davidson | FLSTSE CVO Softail Convertible | Base |
| 2011 | Harley Davidson | FLSTSE2 CVO Softail Convertible | Base |
| 2012 | Harley Davidson | FLSTSE3 CVO Softail Convertible | Base |
| 2001-2003 | Harley Davidson | FLSTSI Heritage Springer | Base |
| 2000-2002,2007-2009 | Harley Davidson | FLTR Road Glide | Base |
| 2000-2006 | Harley Davidson | FLTRI Road Glide | Base |
| 2009 | Harley Davidson | FLTRSE3 CVO Road Glide | Base |
| 2000 | Harley Davidson | FLTRSEI Screamin Eagle Road Glide | Base |
| 2001 | Harley Davidson | FLTRSEI2 Screamin Eagle Road Glide 2 | Base |
| 2011-2013,2016 | Harley Davidson | FLTRU Road Glide Ultra | Base |
| 2011,2015-2016 | Harley Davidson | FLTRUSE CVO Road Glide Ultra | Base |
| 2015-2016 | Harley Davidson | FLTRX Road Glide | Base |
| 2010-2013 | Harley Davidson | FLTRX Road Glide Custom | Base |
| 2015-2016 | Harley Davidson | FLTRXS Road Glide Special | Base |
| 2013 | Harley Davidson | FLTRXSE2 CVO Road Glide Custom | Base |
| 2008-2009 | Harley Davidson | FXCW Rocker | Base |
| 2008-2011 | Harley Davidson | FXCWC Rocker C | Base |
| 2000-2005,2007-2010 | Harley Davidson | FXD Dyna Super Glide | Base |
| 2007-2017 | Harley Davidson | FXDB Street Bob | Base |
| 2006 | Harley Davidson | FXDBI Street Bob | Base |
| 2005,2007-2014 | Harley Davidson | FXDC Super Glide Custom | Base |
| 2005-2006 | Harley Davidson | FXDCI Super Glide Custom | Base |
| 2008-2017 | Harley Davidson | FXDF Fat Bob | Base |
| 2009 | Harley Davidson | FXDFSE CVO Dyna Fat Bob | Base |
| 2010 | Harley Davidson | FXDFSE2 CVO Dyna Fat Bob | Base |
| 2004-2006 | Harley Davidson | FXDI Dyna Super Glide | Base |
| 2006 | Harley Davidson | FXDI35 Dyna 35th Anniversary Super Glide | Base |
| 2000-2005,2007-2009 | Harley Davidson | FXDL Dyna Low Rider | Base |
| 2014-2017 | Harley Davidson | FXDL Low Rider | Base |
| 2004-2006 | Harley Davidson | FXDLI Dyna Low Rider | Base |
| 2017 | Harley Davidson | FXDLS Low Rider S | Base |
| 2000 | Harley Davidson | FXDS-Conv Dyna Convertible | Base |
| 2007 | Harley Davidson | FXDSE Screamin Eagle Dyna | Base |
| 2008 | Harley Davidson | FXDSE2 Screamin Eagle Dyna | Base |
| 1999-2005,2007-2008,2010-2017 | Harley Davidson | FXDWG Dyna Wide Glide | Base |
| 2001 | Harley Davidson | FXDWG2 | Base |
| 2004-2006 | Harley Davidson | FXDWGI Dyna Wide Glide | Base |
| 2000-2001,2003-2005 | Harley Davidson | FXDX Dyna Super Glide Sport | Base |
| 2004-2005 | Harley Davidson | FXDXI Dyna Super Glide Sport | Base |
| 2001-2003 | Harley Davidson | FXDXT Dyna Super Glide T-Sport | Base |
| 2011-2013 | Harley Davidson | FXS Blackline | Base |
| 2013-2017 | Harley Davidson | FXSB Breakout | Base |
| 2013-2014 | Harley Davidson | FXSBSE CVO Breakout | Base |
| 2016-2017 | Harley Davidson | FXSE CVO Pro Street Breakout | Base |
| 2000-2007 | Harley Davidson | FXST Softail Standard | Base |
| 2000-2009 | Harley Davidson | FXSTB Night Train | Base |
| 2001-2006 | Harley Davidson | FXSTBI Night Train | Base |
| 2007-2010 | Harley Davidson | FXSTC Softail Custom | Base |
| 2000-2007 | Harley Davidson | FXSTD Softail Deuce | Base |
| 2001-2006 | Harley Davidson | FXSTDI Softail Deuce | Base |
| 2003 | Harley Davidson | FXSTDSE Screamin Eagle Softail Deuce | Base |
| 2004 | Harley Davidson | FXSTDSE2 Screamin Eagle Softail Deuce 2 | Base |
| 2001-2006 | Harley Davidson | FXSTI Softail Standard | Base |
| 2000-2006 | Harley Davidson | FXSTS Springer Softail | Base |
| 2001-2006 | Harley Davidson | FXSTSI Springer Softail | Base |
| 2007 | Harley Davidson | FXSTSSE Screamin Eagle Softail Springer | Base |
| 2008 | Harley Davidson | FXSTSSE2 Screamin Eagle Softail Springer | Base |
| 2009 | Harley Davidson | FXSTSSE3 CVO Softail Springer | Base |
| 2000-2019 | Harley Davidson | XL1200C Sportster 1200 Custom | Base |
| 2016-2019 | Harley Davidson | XL1200CX Roadster | Base |
| 2007-2011 | Harley Davidson | XL1200L Sportster 1200 Low | Base |
| 2007-2012 | Harley Davidson | XL1200N Sportster 1200 Nightster | Base |
| 2018-2019 | Harley Davidson | XL1200NS Iron 1200 | Base |
| 2004-2008 | Harley Davidson | XL1200R Sportster 1200 Roadster | Base |
| 2000-2003 | Harley Davidson | XL1200S Sportster 1200 Sport | Base |
| 2014-2017 | Harley Davidson | XL1200T SuperLow 1200T | Base |
| 2012-2016 | Harley Davidson | XL1200V Seventy-Two | Base |
| 2010-2019 | Harley Davidson | XL1200X Forty-Eight | Base |
| 2018-2019 | Harley Davidson | XL1200XS Forty-Eight Special | Base |
| 2007 | Harley Davidson | XL50 50th Anniversary Sportster | Base |
| 2004-2008 | Harley Davidson | XL883 Sportster | Base |
| 2000-2009 | Harley Davidson | XL883C Sportster 883 Custom | Base |
| 2005-2010 | Harley Davidson | XL883L Sportster 883 Low | Base |
| 2011-2019 | Harley Davidson | XL883L SuperLow | Base |
| 2009-2019 | Harley Davidson | XL883N Iron 883 | Base |
| 2002-2003,2005-2007 | Harley Davidson | XL883R Sportster 883 Roadster | Base |
| 2000-2003 | Harley Davidson | XLH1200 | Base |
| 2001 | Harley Davidson | XLH883 | Base |
