This CR2 style is for using the threaded post / no nut. If your spark plug has a nut most can be uncrewed to expose the threads and use this type of spark plug cap.
NGK Racing Cables are designed for the serious racing enthusiast. Low resistant racing cables improve sparking energy leading to improved engine performance. Durable in construction NGK Racing Cables feature high temperature silicone outer jackets, solid copper wire strand core and high temperature resistor covers.
Resistor Covers come equipped with 5 k ohm ceramic resistors to help in the reduction of electro Magnetic Interference and Radio Frequency Interference which can interfere with electronic ignition components causing misfires and poor engine performance. Perfect for use with mopeds and motorcycles of the past and today.
NGK Part # 8048