NOS Mopar Piston Ring Set 1956-66 Wide Block 318 Standard Bore #2421703Piston Ring Set: This is a NOS piston ring set for all the years and models listed below with 318 Engines. This was commonly referred to as the "Y" or wide block 318. This is an original NOS Mopar set and comes in original packaging. Years 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966 Models Dodge: Royal, Coronet, Custom Royal, Royal Lancer 1956, 1957, 1958, 1959 Dart Pioneer, Dart Phoenix, Dart Seneca, Matador, Polara, Polara 500,