There's a steak I used to call a "mystery steak." It's oval, (beef!) and has a thin line of gristle right down the middle, parallel to the long axis of the oval. Haven't seen them in years. They were excellent grilled!
I'm from IL where corn-fed cattle is in abundance and you can get an awesome steak at any grocery store or any of many meat markets.
What is it about CO, where I currently live? Can't find a decent cut of meat anywhere without paying an arm and a leg for it? Grain-fed too, which they advertise as though it is something special.
Tripe is not Tip-Sirloin....and Chitterlings are not Fillet Mignon..... Inerds are for the cats or for burying...
Your description sounds like a blade steak.