The ring gear is a replaceable part on the K532, but JD not listing it is no surprise, as they sold a flywheel to my late Father for an Onan P218, to the tune of $500, when his ring gear went bad, I went the local Onan dealer bought a $70 ring gear and starter drive, and returned the Flywheel and showed them the replaceable ring gear, which they said was not a good practise, they always replace the whole flywheel, At $500 so would I, if someone will pay it, easy money! there are K532 flywheels on Ebay.