Thought I would add this link here just as a point of interest. The link and pic below illustrate what a resistor plug looks like inside. (I wouldn't suggest the conversion!). That little cylinder is the resistor.

http://www.peachparts.com/shopforum/tech-help/350345-resistor-spark-plug-converted-into-non-resistor-spark-plug-pictures.html



The interesting thing, is that the original Mercedes plug wire ends looked very similar inside. (I cut one apart once). The resistance embedded was about 5kohm. Bosch/NGK resistor plugs are about that resistance too.

Using new style 1kohm Bosch wires without the 5kohm resistor end but with a 5kohm resistor plugs would, it seems to me, be very much the same as using non-resistor plugs with the OE wires that have the 5kohm embedded resistor.

OE wires are, I am told, now almost unobtanium except from Classic Centre at a price!

This is what our OE wires used to look like:

__________________
Graham
85 300D,72 350SL, 98 E320, Outback 2.5