You just have to find the right guy in your area. I have a few steel cranks stashed out in the shop and I'm sure other Mopar guys do too. They are hard to find in the wrecking yards, but Craigslist will usually find you one. Or check with an old school engine shop. They usually know who to call for parts. I have engine builders call me all the time for Mopar parts since they know that I usually have a few core motors sitting out back.