This offer/listing is for One(1)Set Only, Very RARE and Very Rarely seen New Old Stock, Original Equipment Upgraded Heavy Duty Vintage 83mm bore size X 1.59mm Top Ring, 1.59mm 2nd Ring and the 4.76mm Oil Ring "DEVES Piston Rings" quality made in Sweden, .020/.50mm Over-Sized 3-Groove Piston Ring Set with the patented Hi-Preformance 3-Flex Oil Rings For The Factory Issued Nissan/Datsun Competition Racing Pistions!!! This set is for a 6-Cylinder Water Cooled Engine! Applications are believed to be for The World Famous and Fastly Appreciating: 1969-74 Datsun/Nissan 240Z L24 and 260Z L26 6-Cylinder Engine Model Vehicles With Factory Compitition/Racing Pistons. Related part#s are 904-A.020, 904-A 020, 1904-A.020 and 1904-A 020. This Ring Set is in Near MINT condition and freshly out after over 30 years of dry dealership storage(slightly damaged box and a few lite oxidation specs on a couple rings). Please study photos carefully, check your measurements, ask any questions and double check/compare your actual needed part# to our listing prior to bidding. All NOS parts are subject to some possible deterioration, oxidation and shelf-ware from age and long term storage. For this reason we can offer NO Warranty on New Old Stock Parts!