What thread size for 8mm ex stud?

I am installing a new stainless header and thinking I should try to find some stainless nuts fro it. It is the larger studs that the later 1000's had verses the 6mm studs of the 900's. What is the thread size or designation? Thanks.
Wayne

8mm x 1.25 pitch

THANKS!

floivanus wrote: 8mm x 1.25 pitch