New factory Mazda OEM crankshaft bolt for NA and NB Mazda Miata. This is the crank shaft bolt that connects the timing gear and pulley to the crankshaft. The crankshaft bolt for 1990-1991 short nose crankshaft is smaller than the 1991-2005 crankshaft bolt. Part numbers B630-11-406C (90-91 short nose bolt) or B3C7-11-406 (91-05 bolt). Fits 1990-2005. Choose between 1990-1991 bolt or 1991-2005 bolt.
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