97turboteg

so I took my motor (b18b1) out of my 97 acura integra our a few months back to get built, then put it back in. But when I put it back in I realized I was missing the nut for the drivers side torque mount...Now, its making noise, so I need to get another one...Can anyone tell me what size of a nut that is so I can get any nut from lowes or what not...i'd greatly apprecciate it.
thanks