420SEL Jake, the M112 does not have long wires for the secondary circuit,
so no need to replace them (coil on plug with 2 plugs pr coil).

For a DIY, look here;
http://www.mbworld.org/forums/c-class-w203/216940-diy-m112-spark-plug-r-r.html

br,
syljua

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1998 CL500 W140
1984 230E W123