Ok, then I'll definitely remove the wiper assemblies from two cars I'm scrapping, and invent what I have (at least another three sets). I'm reinstalling them on my 500E, but if I have lots of spares left I'll post them for sale here, for a bit more reasonable price.
Fun fact, in Sweden headlight washer were mandatory by law on all cars until sometime in the 90's, that's why all 124's in Sweden, even a base model 200E is fitted with them. So the wiper assemblies are not hard to come by here. Of course, most of them will need a service etc, and perhaps a lick of paint on the arms.