New factory Mazda OEM engine crankshaft woodruff key for NA and NB 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 B3C7-11-317. Fits 1991 with a VIN # higher than 209447 - 2005.
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