Here's a photo of the plugwire resistor. This is the piece that connects to the sparkplug. It is easily unscrewed from the wire. No need to replace the wires. They're made of steel.

http://img.eautopartscatalog.com/live/F101013373BOS.JPG

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"