Like stated above, the 9 1/4 has 12 bolts holding the cover on, I believe the 8 1/3 has 10. The axle tubes on the 9 1/4 sedge down about 12" from the center, about mid way between the spring and the center.
A 9 1/4 cover is shaped a lot like a 9 3/4 cover, where an 8 1/4 is more round/oval. I'll see if I can get pictures. Gene