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The Mahle OE plain piston ring set is a Performance Steel Napier THM-13 collection sized 4.085 x .043 with .135 RW, offered as a plain ring set for direct replacement during engine service. It provides the listed ring dimensions and plain ring profile for use where this exact specification is required, supporting accurate matching to compatible pistons.
Mahle Rings Performance Steel Napier THM-13 4.085 x .043 .135 RW Plain Ring Set
