It looks like the spacer that goes inside the carburetor, where the manfold goes in.
no, that part is way too small to be that. he's holding it in the palm of his hands and you can see the lines in his skin....which shows how small this peice is.
besides that, the part that goes in the carb where it slides onto the manifold is a peice of round plastic tubing, about 1/2" in diameter.