Sonnax scarf cut piston seal MZ-O-3 replaces worn or damaged seals in Mazda FN4A-EL and FS5A-EL (FNR5) converters and Ford 4F27E (Focus) and FN5A (FS5A-EL) converters. This piston seal is an alternative to OE-style square cut seal FD-O-11.

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