DPF Filter Stud

[GottaGo2]

Can anyone tell me where I can buy 1 stud & nut for my DPF filter? I had a shop remove my CAT/DPF and asked them to leave it in one piece but it seems they decided to unbolt it at the DPF flange and in doing so one stud broke off. It almost looks like a wheel stud, does anyone know if I can use a wheel stud in it's place?

I just want to be sure if I need to put it back on for warranty it *appears* to have not been tampered with so I would like to find an exact replacement if at all possible.

And I guess it goes without saying that once the CAT/DPF is removed and the truck is tuned it is really amazing the difference in the way the truck runs.

Thanks
Rc