I don't remember any 10" or 8¼" models... When I worked in some IT groups a couple decades ago, we were still using equipment with 8 inch floppies. Old equipment from the 1970s, but government was still using it into the 1990s.
In 1979 or so, I purchased a Shugart floppy drive for 8" diskettes, for about $400. I designed and wire-wrapped the interface adapter electronics, and wrote the software drivers (for my home brew operating system). A few years later I did the same thing with a pair of 5-1/4" drives. I found I liked the 5-1/4" drives better; the 8" models were clunky by comparison.
If there were 10" or 8-1/4" drives or diskettes, I never saw them.
https://en.m.wikipedia.org/wiki/Floppy_disk