The only caveat to this is that if the ring gear needs replacing the whole OE flywheel would need to be replaced as it is machined onto the flywheel itself.
That is a possible concern.
I was service manager for a Chevy/Pontiac dealership back in the mid-70's thru the mid-80's and I believe we may have replaced one or two flex plates with ring gear in those years. Personally I've had over 65 vehicles, not including motorcycles, and I've never had to replace a flex plate of flywheel because the ring gear was destroyed. As long as the starter remains in good shape and not used when loose, I think the odds are in your favor to NOT need a replaceable ring gear.
With the Miata Stuff 8.4# SFI certified flywheel, that's not a bad price for what it is.
Thanks and have a great day!
