Give Phil at Mercedshop.com a call to get the part. He has other means...

If memory serves me correct, the regulator is mounted to the blower. Just follow the wires. The new regulator looks different, but still mounts to the new blower. Once you get the parts, you'll see.

I also remember that the Fastlane database called for a new wiring adapter and a housing cover. The wiring adapter was already included with either the blower or regulator (I can't recall). My '98 already had the new housing cover, so all I really needed was the regulator and blower. Your mileage may vary...

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1998 E320 120K mi
1991 Miata 80K mi
2001 Ranger 109K mi