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The Mahle OE plain piston ring set is a replacement plain-ring assembly listed as Performance Steel Napier THM-13 sized 4.005 x .043 in with .135 RW. This cataloged ring set provides consistent dimensioning for piston replacement tasks. Use the published bore and width to verify compatibility with your engine before purchasing to ensure proper selection.
Mahle Rings Performance Steel Napier THM-13 4.005 x .043in .135RW Plain Ring Set
