I promise that I searched first. Not saying the information isn't out there, just saying that I didn't find it

Anyways, I was trying to track down stainless hardware for the nuts and bolts to attach y-pipe to main cat and y-pipe to pre-cats so I brought those with me. Seem to all be M10 x 1.25.
But replacing the nuts and bolts that attach the front and rear pre-cats to the exhaust manifolds was an afterthought, so I don't have any of that with me (or removed from the car yet). Could someone please provide those numbers?

Also, if I can't get my hands on stainless hardware locally, is the dealership the next best place for replacements? My Advance Auto didn't appear to have exactly what I was looking for.

Thanks.