I don't see a aftercooler on your engine in the video, Cummins made both a small cam and a big cam 230. Cummins was great at cleaning a warehouse to put engines together.
Some small cams did have offset bolt pattern although I have never seen one. And that damper on yours is a stationary and were pretty useless, pretty common for the mirrors
to shake even from day one. And yes that is a totally obsolete part number, Cummins could find it but they will tell you the same thing. The only thing IMO would be the mating
surface of the pulley on the back.