need quick help with bolt size

[Slamtry]

While changing my coolant today, I lost the front air bleeder bolt. It's
the 10mm bolt about half an inch long that sits just to the right of the
thermostat. The nearest dealer wants to sell me a new thermostat at $74.
(Thanks Miller Nissan of Van Nuys. I'll be sure to give you any business I
ever have). Can anyone tell me the specs of this bolt so I can go and find
one? Or if there's anyone in Los Angeles who has a one they would trade
for a cold beer, I will deliver the beer :-)

Cheers

Dan Hugh-Jones