I had one of those Chinese starters and after three ring gears went back to my old reliable mopar performance on and no more broken ring gears.
looks like the Chinese starter holds crooked off the block. A friend had this problem too 3 or 4 ring gears then ground the block till the starter sat nice and straight!
I personally won't try that $%@ again. 3 ring gears in 3 weeks sucked big time. only time in 33 years with this car I had a ring gear problem and now 2 1/2 years without a problem again just using my 1991 MP performance one though I had it rebuilt this winter!!