This is pretty close to the classic, well known Steak Diane recipe. Obtaining the specific cut called out in this recipe would, sadly, be nearly impossible where I live, in Los Angeles, California. I have never seen this cut name on a package of beef steaks in my 30+ years of being here. There are no "butcher shops" as such, only supermarkets & ethnic markets.
This couldn't be any closer to the original recipe. Thank you.