Re: Bowl problems :(
Try to get one from the same place you got your hookah from. Another issue could be the bowl grommet. If it is warped it can prevent a good fit. Grommets are cheap, so maybe try replacing that. If that fails and you are unable to find a bowl that fits, you might want to try to use something like aluminum foil to make the bowl fit. Just wrap it around the top of your stem to act as a form fitting grommet.