http://catalog.peachparts.com/ShopByVehicle.epc?q=&yearid=1983@@1983&makeid=63@@MERCEDES+BENZ@@X&modelid=6207%3AMBC|1510%3AED|10000134@@300SD&catid=241658@@Brake&subcatid=241705@@Brake+Master+Cylinder&applicationid=W0133-1616041&mode=PA

New MC from Fastlane is approx 140$.
2 listings based on chassis Number.

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83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.