Well as the title says i somehow lost my bowl and downstem. I was smoking my bong with two friends in one of their cars on 4/20 and put it in my bag with my bong but it randomly disappeared and of course i go to smoke it today and realize its not there. Well my question is how to figure out what size downstem and bowl i would need for my bong. And i assume since it has been used i should not take it into the store which i bought it from.