4316 Autolite Spark Plugs Spark Plug Since its inception the Autolite ® brand has provided the automotive aftermarket and Original Equipment manufacturers the highest quality ignition products. We have been in operation for over 100 years and have produced more than 11 Billion spark plugs and glow plugs. Our plugs are specifically designed for each application to meet or exceed OE quality and performance. Autolite makes plugs for Japanese European and Korean cars as well as plugs for Lawn and Garden and Power Sports. As a leading supplier of spark plugs ignition wire sets and Coil-on-Plug boots the Autolite brand has the right ignition products for your vehicle regardless of make or model import or domestic. Applications Year Make Model 1932-1963 Harley Davidson G Servi-Car 1964-1973 Harley Davidson GE Servi-Car 1972-1978 Harley Davidson XLH1000 1958-1971 Harley Davidson XLH900 Copper-Glass Seal Bonds Insulator Terminal Post Center Electrode Together; Assures Full Required Voltage At Spark Gap; Gas-Tight Seal (100 Percent Leak Proof) Multi-Rib Insulator Reduces Danger Of Flash-Over One-Piece Terminal Post Adds Strength Cold-Formed Steel Shell Precision Rolled Threads Full Copper Core Electrode Provides Better Performance In All Conditions Guaranteed To Deliver Quick Starts Good Fuel Economy And Smooth Acceleration Resistor Reduces Radio Frequency Interference (RFI) And Electrode Erosion Limited 2 Year Warranty Reach : 7/16 Inch Resistor : No Electrode Type : Tapered Center Electrode Core Material : Copper Insulator Type : Non-Projected Thread Size : 10 Millimeter Seat Type : Gasket Wrench Diameter : 13/16 Inch Hex