NOS Perfect Circle Piston Ring Set. Part 50564CP .040. See pic.

Perfect Circle 41474 .040 Piston Ring Set – Oversize for Precision Engine

Ford Mercury V-8 95 HP 1939-42 Piston Ring Set 5854A .040 PERFECT CIRCLE NOS VTG

Perfect Circle 41411 .040 Piston Ring Set for Ford Mercury 140 2.3L 4 cylinder

Perfect Circle 41106 .040 piston ring set

Ford Mercury V-8 95 HP 1939-42 Piston Ring Set 8655 .040 PERFECT CIRCLE NOS VTG

Perfect Circle 41514 .040 Piston Ring Set fits 1986-92 Ford Truck 177 2.9L 6cyl

NOS Perfect Circle Piston Ring Set. Part 51421CP .040. See pic.