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The Mahle OE plain piston ring set is a replacement plain-ring assembly specified as Performance Steel Napier THM-13 sized 4.005 x .043 in with .135 RW. Supplied as a 48-piece bulk pack, this set offers catalog-matched ring dimensions for piston replacement and stock replenishment. Confirm the listed bore and width against your engine's requirements before ordering.
Mahle Rings Performance Steel Napier THM-13 4.005 x .043in .135RW Plain Ring Set (48 Qty Bulk Pack)
