If you are referring to the hatch type wing, Lorinser has always had this type of spoiler for the wagon- follow link one to mercedes, W124, small picture
www.fendertrim.com.au/mbenz%20w210%20bodykits.htm
http://www.ultracar.com/Lorinser2/LORINSER%20MERCEDES%20TUNING.html
also try CEC, I don't know if they stock Lorinser for the older models.
W210 style: