I have the same car, and WIS came with it. It was purchased by the PO. I have no idea if they are bootleg or legit. I suspect most if not all of the copies floating around Ebay are bootleg.

WIS is a pain to install, but once you get it working it's fine.

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition