Underhood Fuse Box Stud Size?

[jason1955]

I'm getting ready to install a brake box on my 2000 gmc sierra and was wondering if anyone knew off the top of thier head what size nuts does it take to screw on the studs in the fuse box under the hood? I noticed one stud was larger than the other.

 

Thanks,

Jason

[Gregorio]

Cant remember if that year used #6 and #8 metric like the newer ones or not.