Theropod Vertebra Centrum - Tyrannosaurid?

This is a large vertebra centrum from the 65 million year old Hell Creek Formation of Montana. It's from an unidentified theropod dinosaur but based on the size the most likely candidates are Tyrannosaurus rex or Nanotyrannus. One of the primary was you can tell it's a theropod is the cell size, theropods have significantly larger cell structures. It's fairly solid, but was surface find so the exterior is pretty eroded.