Thanks, James... I did try the service dept but they were not able to offer any spare parts or info regarding my question.
I did realize that the nuts that hold the par cans to the truss are the same size so I am thinking I can repurpose one of them and then use a replacement bolt/nut from local hardware store to (re)secure the par can to the truss bar.
I also tried looking up the bolt head "markings" on the web and found some hits re "china" bolts (which makes sense, I think). It seems like the "4.8" marking is a reference to the "grade" of the bolt... haven't been able to find the "C5" (or "CS, not sure) reference but am thinking it may be a "size"... not sure.
I can't believe I'm the first guy to lose one of these wingnuts!
As noted above, I have a fallback plan but any addt'l help would be appreciated.
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