Vintage Nos American Hammered piston rings koppers piston ring kits, these kits came from a vintage parts yard that has since shut down. These kits were on the parts shelf. Unfortunately I haven't been able to get any info or catalogs for the listed part numbers. Some kits are labeled for applications, Cannot comment theyre accurate. Feel free to message me with ant questions. Listing is for individual kit. Will sell as whole lot aswell.