Problem with 973-383 exhaust system

On my kitfox with its 912ULS I am replacing the old kitfox supplied exhaust system with the Rotax 973-383 and have encountered a problem.  Everything came in a Rotax packaged kit from advancedpowerplant so I should have all the right parts but something is very wrong with the clamp that attaches the stinger to the muffler as it appears too small.  It was very difficult to fit over the stinger and when its in position ready to clamp, the bolt provided does not have any thread protruding so I can fasten the nut.  Am I doing something wrong?  Attached is a photo