Ignition Service Kit Coils+Spark Plugs+Socket+Dielectric Grease for MERCEDES. This product data sheet is originally written in English. 4 x Ignition Coils with Spark Plug Connectors. 4 x Spark Plugs - NGK SILZKFR8H-7S (92725). 1 x Spark Plug Socket - 14 mm, 12-Point - 3/8 Drive - Extended Swivel Head. (Features a swivel square-drive to access hard to reach spark plugs, 15-20 degree max swivel range, rubber insert holds plug). 1 x Permatex Dielect Tune-Up Grease. DELPHI / NGK / CTA TOOLS / PERMATEX. 2015 - 2018 C300 For cars with Delphi Ignition Coils. 2016 - 2018 C350e For ...