PISTON RING SET FOR BMW F20 F21 F22 F23 F30 2.0 DIESEL N47D20C N47D20A N47D20B
N47D20C, N47D20A, N47D20B. Piston Ring Specs Set of 4 STD Sized Piston Rings. Middle Ring Thickness - 1.75mm. Top Ring Thickness - 1.75mm. Oil Ring Thickness - 2.0mm. Components used for motor sports will not be covered in warranty claims.