Mahle OE plasma-moly piston ring set specified for a 4.090 in bore with ring dimensions of 1.5 mm x .151 RW. The listing identifies the rings as Plasma Moly Steel and is offered as a direct replacement option to match engines requiring that bore and ring specification, suitable for rebuilds or maintenance where exact ring sizing is needed.
Mahle Rings Plasma Moly Steel 1.5MM x .151 RW 4.090in Bore Diameter Moly Ring Set