About 6 months ago I was smoking with my brother and we broke the bowl/downstem for the bong, it's an Xhale bong about 1.5 feet tall. I'm wondering what size does the downstem and bowl have to be for it? How can I measure it? I think it may be 14.5 but i am not sure as i have never replaced a downstem/bowl before. heres a picture maybe you can help me.