I read in another post about the unavailability of new XS11 piston rings. Try this link. I often cross-referenced rings for obsolete compressors with very good results. There are often other motors which use almost exactly the same rings as the ones you are looking for. Sometimes, there are complete sets of rings (compression, scraper, oil control) which will drop right it, or can be made to fit by slightly opening the ring grooves on a lathe, or filing the ends. Anyhow, for what it's worth, you can check out the Hastings catalog.
http://www.hastingsmfg.com/Catalog/diametrical.asp
http://www.hastingsmfg.com/Catalog/diametrical.asp
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