What you have is a shoulder bolt, it's only threaded part way either to keep it from going too deep,and hitting something it shouldn't, or to keep from squeezing something too tight... or both.
The bracket shows a big hole Siamese with a little hole. logic would dictate you pop the screw/plastic thingy, into the big hole and slide the sucker over to the small hole, easy peazy. But, if you look at the bracket, each end would have to slide in the opposite direction. Crap. That tells me maybe the Siamese holes are for two different applications. Looks like the small holes are what fits your stuff.
6-32 is as common as stars in the sky, so are rubber grommets, I've got a shitload of both. Are you going to be home tomorrow?
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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