The Mahle OE plasma-moly top piston ring set is specified for a 4.315" bore with a .043" edge width. This ductile, moly-faced top ring is supplied as a matched set to meet the stated dimensional and sealing requirements. It provides the correct fit for reconditioning pistons to original specifications and is intended for applications that call for a plasma-moly top ring in the given size.
Mahle Rings 4.315in X .043 Edge Width Plasma-Moly Ductile Reduced RW Top Ring Moly Ring Set