You will need:

Pedal assembly
Flywheel (match balanced to the wagon engine)
Piolet bearing
Clutch/pressure plate
Transmission
Shorter drive shaft
Pedals
Shift assembly
shortened shift linkages

The 300Ds that had a factory manual transmission seem to have come with a balancing disc. This disc may smooth the vibrations that many of us with manual transmission conversions have at low RPMs in some gears.

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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