Converter diameter

I have a unknown converter that measures 10.5" in overall diameter. Could this be a 9 or 9.5" converter? The known 8" is 9.5" overall diameter. Maybe no way to confirm unless cut open?

10.5 OD should be a 9.5” or 10” unit.

Is there a serial number on it? That might help.

There are couple numbers stamped on it 10490R, 7174, 1420.

From my personal experience, some converter maker's diameter claims and any semblance to a tape measure are a total mystery.

Never paid much attention to it until this one that I didn't have labeled. I sent the 8" off to be redone but am now questioning what this other unit that measures 10.5" actually is. Guess ill be getting it cut open!