86-20 Sportster, (except 08-10 XR1200, 10-12 XR1200X), 99-17 Dyna, 00-17 Softail, 99-16 Touring, 97-02 M2, 97-98 S1, 97-99 S3, 09-16 Trike
Spark Plugs including a wider-base insulator which provides an easier path to speed the transfer of heat and a longer insulator nose containing a center electrode of pure copper inside of chrome-nickel to transfer heat between firings and help resist fouling.