http://www.peachparts.com/Wikka/W124BlowerMotor

That puts the wiper assembly in your hands. Then comes taking apart the linkage to get to the panel that includes that skirt. I've been into a couple of wiper assemblies, 140 and 208 but not 124. It would be difficult to talk someone through that process. Consider replacing the wiper assembly with a good used unit.

Sixto
87 300D