Added from email photos sent by Craig:
Craig\'s original vacuum advance Craig\'s vacuum advance and a truck vacuum advance Craig,
You vacuum advance mechanism is off an automobile engine. If you vacuum line was already plumbed for attachment to the automobile vacuum advance, you might as well get an automobile vacuum advance mechanism. I think that I found one at Harmon's and maybe at the Filling Station and at a few other sites (they had photos that could not be copied). If you cannot find one, post a reply here and I will look for a source.
Classic Parts of America (Chevy Duty) will most likely take the part back (but you might have to pay return shipping).
Tim
