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I'm the one who suggested the 300SD dual pulley setup for your car so I thought I should weigh in.
According to EPC the balancing disk and vibration absorber for the 300SD are different than your 300D NA. I attached a thumbnail from another thread that illustrates the 300SD setup. If the donor engine didn't have the vibration absorber what was in it's place to take up the space between the pulley and the balancing disk?
I would try to use your original balancing disk and use a 300SD vibration absorber. The thickness of that part will determine the belt line. I wouldn't get too concerned over its mass as it was designed for the same rotating assembly. From everything I've seen it's neutrally balanced and is not part of the balanced rotating assembly.
If you have to change balancing disks that's another story and you may get into issues with engine balance.
Another thought: The turbo engines have an oil pump drive sprocket on the crank nose behind the balancing disk. This may have changed the overall length of the crank nose and changed the distance between the mounting face of the balancing disk and the front of the block. That would necessitate a change in all three parts to keep the belt line. If that's true you will not be able to use the 300SD crank pulley without some modification.
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1969 220D 5 Speed (OM616)
1983 240D 4 Speed
1985 300D Auto 376K
1985 300D Auto 275K
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