I'm not sure if this is the same circumstance, but maybe?

While driving my 1983 300SD Turbo, my crankshaft bolt came out, and the harmonic balancer fell off of the crank shaft. I heard the bolt drop and the steering became stiff and the battery light came on, so I pulled over and shut it down.

I pulled off the fan and fan shroud & the only thing holding the harmonic balancer on was the belts. I have a crankshaft with two notches on it and am wondering what parts i need to put everything back together..

I'm assuming a woodruff key, crankshaft bolt & crankshaft seal. Anything else?

Also, does anyone have schematics for this?