Can anyone identify my rear differential? 8 3/4 but wrong markings???

I have a 54 Ford and a 49 Plymouth to compare. Unfortunately, they are both 250 miles away.
Either way, it's pre-57 Ford or Mopar, and not a "nine inch" Ford or a 8 3/4 Mopar. Either one will be a ***** finding parts.
To be honest, I would plan on replacing it. My candidate would be an 8.8 ford.