NOS Perfect Circle Piston Ring Set. Part 50141CP .030. See pic.

Engine Piston Ring Set Mahle 40564CP.030

Perfect Circle 50564-030 Engine Piston Rings - .030" Oversize

4.030" Bore Cast Piston Ring Set for Chevy SBC Ford SBF 5/64 5/64 3/16"

NOS VINTAGE PERFECT CIRCLE PISTON RING SET FORD CHEVY (50564 .030)

Enginetech Piston Ring Set M40058-030; 4.030 in. Bore Drop-In 5/64, 5/64, 3/16

Enginetech Piston Ring Set R40058-030; 4.030 in. Bore Drop-In 5/64, 5/64, 3/16

NOS Perfect Circle Piston Rings. Part 40722 .030. See pic.