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The Mahle OE Plain Ring Set is a piston ring kit intended for engine repair, listed with Napier THM-13 sizing at 4.505 x .043 and .135 ring width. This OE-style plain ring set is provided to match engines requiring those exact dimensions and is intended for restoring proper piston-to-cylinder sealing where those specifications apply.
Mahle Rings Performance Steel Napier THM-13 4.505 x .043 .135 RW Plain Ring Set
