Its a PITA trying to find readily available NR plugs. I have a cousin that lives in Germany and works for the post office, but still, I don't want to have to wait for 2 weeks to get plugs. I was under the impression that you can unscrew the metal tip that screws into the ceramic portion of the plug and there is the resistor inside. So I was thinking you unscrew the tip, take out the resistor through the opening, insert an equal piece of legnth of copper (maybe a cut coat hanger) for continuity, and screw the cap back on.

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1990 190E 3.0L