Require 2 retaining nuts for a Pro 38cc chain guide?

After using chain saw to tidy up a few branches in the garden. The Pro 38cc chain and guide bar were taken apart for cleaning. During the process a sweeping up exercise was done by the female part of the crew, they inadvertently swept up the the 2 retaing bolts for the bar. Where can I get replacements or a similar nut,

Mitchell Brown
May 2008