Sumax Pro 8mm Spark Plug Wire Set For Harley Touring Features: 7mm silicone with synthetic jacketing resists heat, oil, and abrasion A combination aramid helically spiral wound core at 350 ohm per foot resistance delivers greater spark energy, while improving power, idle, and fuel efficiency Matching silicone boots protect against high exhaust temperatures Double spring locking terminals for secure-vibration proof connections Cloth Jacket is rated at 450 F Placement of Wires: Front Lower Left Tower 3: 34 90 coil 135 plug, Rear Lower Left Tower 4: 18 90 coil 135 plug, Front Center Cylinder Tower 2: 30.5 90 coil PC plug, Rear Center Cylinder Tower 1: 17.25 90 coil PC plug