Re: hookah vase...
If you have a ruler just measure the opening of the base then its height and just buy a comparable one. If there is a 0.5cm difference in the opening I think it will help you out a bit and it should seal tightly. If not you have two options of either replacing the grommet/use electric tape or by sanding it down. In your case just be sure that the height of the base is appropriate for your stem and you should be good to go.