It's from Matt Rolfe's real life late model from what I understand. You might not find an exact numberset but there are plenty that are pretty similar. The old Red Bull numbers come to mind...
Then there's this set, called CX23. It's probably not what you had in mind since it's a lot rounder and not as boxy... also I made it and I put it on NNRacing a long time ago.
EDIT: I posted it to the downloads section here.