Mahle OE chrome top ring set for a 3.1890-inch bore with a 1.2mm standard-gap chrome steel top ring is sold as a matched set for rebuild applications. These rings provide consistent compression sealing when the bore and section match the engine's specifications and should be installed with the correct end-gap and break-in procedures.
Mahle Rings 3.1890 X 1.2MM Chrome Steel Std Gap Top Ring Chrome Ring Set