I unfortunately have to 3rd that decision, from what I know and past experience around machinery. You might get lucky, but you need to go over that crank snout with a micrometer and verify it isn't worn down or else you'll be back to square one in short order. If you caught it right off you might be ok, any extensive time with it that way and you're likely in for a crank. As far as the balancer, if you're talking about separating it at the rubber grommet part, I've never seen one sold that way since it is a pressed/molded together affair. You might pick one up inexpensively from a rebuilder such as Damper Dudes. Get a plan of attack, assess the crank, if needed find a good one at the wrecker, maybe from a car that was in a side/rear wreck, means the car was running when it got there. (avoid frontal wrecks as this usually kills the oil cooler and possibly starves the engine until stunned owner shuts down).
Buy new bearing shells, you never ever want to transfer a used shell between engines since they wear differently. Grab a good balancer while you're there. You can always go for new or rebuilt parts too if you prefer $$.

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Chris
64 190D R.I.P.
80 240D W/617 engine -for sale
82 240D -for sale