That's odd. I have a 1982 300SD parts car as well (actually had two of them). The one I have now, I don't see the wire either. No telling what kind of can of worms I've opened. Like you mentioned, the picture from mach4 looks like the one that came out of my SD originally too. I just need get out there and look at it closer tomorrow and see what I can find out.

Thanks,

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1984 300SD, 729K "Ol' Blue"
1980 240D 4-spd manual 470K "The Ugly Duckling"
1988 Ford F250 7.3 diesel, aftermarket turbo
1987 300D, 380K
1982 300D, 276K
and many more MB's from the past!