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The Mahle MS 2mm support rail is specified for bores in the 4.000–4.040 range and serves as a piston ring support component. Supplied to match the listed bore range, this 2mm support rail is intended for engines needing precision ring sizing within that diameter window. Use it where correct ring rail dimensions are required to maintain ring alignment and sealing.
Mahle MS 4.000-4.040 2mm Support Rail
