A new ball OEM ball joint is $25, why would you spend all the time to replace the ball joint, then use a used part?! http://www.***************/search/product.aspx?sid=2lo1bh3pc3cae155v5qjkpa5&makeid=800016@Mercedes&modelid=1193532@300CD&year=1980&cid=ball@ball&gid=7456@Ball%20Joint

********az has some good prices. I just got all the parts I need to do the front suspension (not tie-rods) for $300

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine