I have a W123 - 300D with OM617.912 Engine (NA)

I want to install the double alternator pulley and I need the corresponding double crank pulley. I could not find anything suggesting that the NA flavor had the double pulley option. If so, please let me know.

I sourced the double alternator pulley and double crank pulley from a 1982 (1983?) 300SD from the yard on Sunday. It had the standard OM617.95X engine.

After removing the crank pulley from my car, it is very clear that the set up is different.

Here is my question:

Has anyone swapped out the NA harmonic balancer for the Turbo one?

The pulley assembly from the NA is longer and heavier.

I looked and cannot find anything concrete -- here's a bunch of threads in one stop shopping.

Diesel Harmonic Balancer threads

Although my NA engine will most likely not be in my car another year (I hope), I want to knock out all of my R&D, et cet., and other changes in a "final" version in the next few months. The car is grounded and is not leaving the garage until the work is done. keeping it as a DD was nutty ...

If the harmonic balancer can be swapped, then that adds around 3" of space to the front of the engine plus a double alt pulley ...

Any help is greatly appreciated !!!!!