I found almost 25 flywheels on Ebay in a search. There were even more found on Google. Some of these flywheels have the V shaped cut, or V notch. Not all but many of the unlightened 93 tooth flywheels have this. See;
If there is damage from a 9 tooth starter being used on a ring gear designed for an 8 tooth starter the damage will progress as the flywheel spins. It will appear at one edge of the notch in some places, the middle and then the other edge. Now I've never seen this but it makes mathematical sense. I've never seen a ring gear that didn't work. A few stories about this but nobody has ever taken a picture.