I ran that number on Google and found one on Craigs list. It was advertised as an 89 - 93 Dodge Cummins for use with the 13 inch Sachs clutch. I also ran it on a Chrysler dealer parts website and apparently the number has either been superseded or is now obsolete.
Talk to your local transmission/clutch/mechanic shop to see where they get thier flywheels from. I pay $35-$50 for reman flywheels+ a $40-$80 core. Worst case scenario that's $130 for any flywheel you could need surfaced with a perfect ring gear.