Horizontal Flush-itude> Check. Both "authentic" atties are outer-wise 22mm in diameter.
Vertical Flushingness> Does yer mech have an adjustable atty-side 510 positive pin? If yes, Check too. If not.....then as far as I know only the Russians these days have truly adjustable posi-pins. So with a
kayfun> Maybe, cause you could get lucky. With a Russian/R91 > Check
three!
Are either of them any good? Well....you didn't ask, so I wont burden you with my current somewhat less than eager post-dispositioned opinion of them.
Cheers.