The 18c - Wiring Harness (coil) assembly is constructed from several parts from which the Ignition Coil is the most expensive.
Some items from this specific schematic: Nut, Spring M5, Screw, Ignition Coil, Lh Spark Plug Cable.
eleven components are shown in this Dvl 2015 Eu (diavel) D170-00015 18c - Wiring Harness (coil) exploded diagram.