.020 Inch Oversize Piston Ring Set for 65-90 CJ, YJ, SJ, J-Series C104 w/ 3.8L, 4.2L Crown Automotive. 020 inch Oversize Piston Ring Set for 1971 1986 CJ 5, CJ 6, CJ 7, CJ 8, 1987 1990 YJ Wrangler, 1965 1986 SJ, J Series, 1972 1973 C104 Commando, All w 3. 8L or 4. 2L Engines, For 6 Pistons Features and Benefits: . 020 inch Oversize 12 Month Warranty Direct Replacement For 6 Pisons Details: Material: Steel Finish: Unpainted Hardware Included: Use Existing Hardware Interchange: J8121683. 020 Application: 1965 1971 Jeep J Series J 3500 w 3. 8L (6 232)