I thought that this was something that couldn't be found? Did I find gold or am I just out of the loop?
This place has some decent prices. They have the turbo return line seal too.
http://www.bestforeignparts.com/RenderScriptTemplate.epc?_cmd=epccat_VehicleWHD&cookieID=2DN0D1TSQ2DN0D820R&yearid=1985%40%401985&makeid=MERCEDES+BENZ%40%40MERCEDES+BENZ&engineid=1194342%40%40300TDT++%2F+L5%2D2998cc+3%2E0L+DIESEL+FI++Turbo%40%40300TDT&catid=Engine+Seals%2C+Gaskets+%26+Sets%40%40Engine+Seals%2C+Gaskets+%26+Sets&mode=PA&subcatid=Hydraulic+Pump+Seal+Kit@@Hydraulic+Pump+Seal+Kit&clientid=bestforeignparts.com

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Currently driving a very clean 1985 300SD from the West Coast.