Long story short, friends dropped my bong, down and bowl head shattered, they're buying me a new one. Since they threw the pieces away, im uncertain how long the downstem is, but its a... - DELTA 9, 10 inch bong. - 18.8 mm downstem - heard it require a grommet - probably cant be longer than 5 inches Can someone find one they know for certain will work? Also, for sizing and such whats does it mean when there are two numbers on the joint size, like "14.4mm > 18.8mm" ? Thanks in advance