Frame Rail reproductions

I'm restoring a 1974 Barracuda and need to replace a front driver-side frame rail. AMD and Goodmark have these on backorder. Dynacorn has them available for 1970-74 Challengers. I feel like these should be interchangeable, but can't find confirmation. Does anyone know for sure? Second question: If they are interchangeable, does anyone have experience with the quality in the Dynacorn parts? What is your impression of them?

Thanks,
Mike
Author: MONSTERMAKER