Air cleaner attachment

Hi,
First off sorry for the horrible picture, my phone and it sucks. So anyway, my air cleaner rattles around because it fits so loosely. The PO put a large nut and 2 washers as spacers under the wing nut. But this is the bolt that holds it to the carb, it is held on by what might be twisted bailing wire or old coat hanger. Is there a part I can get to fix this? It lets all kinds of crap onto the filter from underneath.

Thanks
Tim