Used factory engine coolant water thermostat housing bolt or nut for NB Mazda Miata. This is one of the either the bolt or the nut that attach the thermostat housing to the coolant water neck. Part numbers 9979-40-825 (bolt) or 9994-00-801 (nut). Fits 1999-2005. Sold individually as either one bolt or one nut. Please choose between bolt or nut.
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