New factory Mazda OEM engine crankshaft woodruff key for short nose 1.6 liter engine for Early NA Mazda Miata. This is metal rectangle that fits into the key way cut out on the front nose of the crankshaft. The crankshaft woodruff key keeps the crankshaft pulley from spinning around the nose of the crankshaft. Part number B630-11-317A. Fits 1990-1991 with a VIN # lower than 209447.
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