All of those plugs shown at the parts store links are resistor plugs. Not the way to go for the M103 motor. Bosch H9DC0 or NGK BP5EFS (or BP6EFS) are the right plugs and are available either through MB dealers or the Classic Center in Irvine, and maybe even from Fastlane Phil. At one time, Phil told me they were not stocking these, but that may have changed. Agree that Beru ignition wires are the best.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't