Broken rocker arms two weekends in a row

I'm with you, I've never seen a rocker arm break like these have. I wish I still had the Norris stainless steel roller rockers that were on my old W2 Dart. But I didn't have a spare set of rockers to swap them out with when I sold that car so the new owner is all set in that regard!
Last I read, Norris was still making them but out of his small home garage.