You are buying 2x ZFR5E-11 NGK SPARK PLUG FIT Nissan Navara D21 2.4L KA24E 4Cyl EFI Gap mm:1.1 92-97. The workhorse, at the heart of smooth-running engines around the world. Spark Plug. SPARK PLUGS. Spark plugs are the "window" into your engine (your only eyewitness to the combustion chamber), and can be used as a valuable diagnostic tool.