I just got finished...didn't even need to use my new U-joint set. All I needed was a cheapo flex head ratchet with the Alan socket on it. Worst part was heaving it into place, and when the positive battery lead migrated back to the positive post...

616 and 617 turbo starters seem to have the same part #

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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