Twenty-Two ring gear is hard to find. Ray Puffer in Albany looked all over the place for one that would match (diameter for gear section and ID smaller or equal to flywheel flange, and then tooth count / profile. I think Ray elected to rotate his existing ring gear 90 degrees so good condition teeth were available at starter engagement time. If you don't already have a ring gear, that's probably a bigger challenge than fitting up a nose for the starter motor.
That written, if you do find something suitable, please post the details here because folks are regularly asking about them.