New factory Mazda OEM piston ring set for Early NA Mazda Miata. This is a set of four piston rings in either .25 oversize (78.25mm) or .50 oversize (78.5mm). Part numbers B6Y4-11-SD0B (.25 oversize) or B6Y4-11-SDXB (.50 oversize). Fits 1990-1993 Mazda Miata. Sold as a set of 4 piston rings. Choose between 78.25mm or 78.5mm.
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