Hello:
Someone had this same request not too long ago and someone else offered up a name. I've done a search but can't come up with it.
Did a Google on custom piston rings and got Precisionrings.com here in Indy but they don't do motorcycles.
Anyone remember or know of the source of which I speak?
Of course I haven't tried the obvious OEM or eBay, I'm going there now. Jeesh.