fifteen components are shown in this Z550g4 Gt550 1987 United Kingdom Fg Ignition System exploded diagram.
On this parts fiche the Cap,spark Plug"ld05f" is the most specified component.
Some items from this specific schematic: Coil-igniton,#1&4, Nut,flanged,6mm, Grommet,spark Plug Cp, Damper,igniter.