I just need to know what size nuts to get for the studs on the exhaust manifold.
Yeah I searched but there is far too much contradicting information.

8mm, 10mm, 12mm, 14mm...1.0 pitch, 1.25 pitch...
I'm going insane here! I just need one answer.

And yes I'd love to jack it up and figure it out myself, except
I don't have an available garage, I have no jacks, and its 5 degrees out.
I'm taking it to a friend's place to have work done and would like to show up with the right hardware.

 

M10 x 1.25

OEM PN: 14094-JG30A

EDIT:

Just to warn ya that size nut is hard to find. Neither lowes, home depot, nor a local HW store carried them so I got them for ~$1 a piece at the local stealership. It's a nut used on most nissan exhaust so they'll have it in stock.

 

Awesome, thank you so much! Maybe Ace will carry it, my local Ace
has a HUUUGE selection of hardware.
If not, there's a Napa in town, and an O'Reilly's and an Advance Auto about 5 miles away.
Either way, I appreciate it!

 

For future reference to anyone wondering, my manifold bolts were actually M14 X 1.25

 

Well new mechanic the size of a nut is not determined by it's outer diameter but it's inner diameter. You used a 14mm wrench to tighten the bolt onto a 10mm stud.

The nut size is no doubt a M10 x 1.25.

 

i work at ace and we have them, but i do believe the OD is 15mm for the ones we sell.

 

That is an interesting thing. I had to get some nuts when I was working on my car (not the exhaust) and the originals required a 12mm wrench while the hardware store replacements required a 13mm wrench.

 

Size of wrench is irrelevant.

 

She only told you that to make you feel better.