http://www.grasscity.com/eu_en/ehle-diffuser-downtube.html#.U2MQHvl_uSE I'ma buy that diffuser for this <a>bong http://www.grasscity.com/eu_en/black-leaf-6-arm-perc-dome-perc-glass-ice-tube-blue-and-black.html#.U2MNxPl_uSE</a> But i don't know what size i should choose at the diffuser.. Oh, and if you've got any ideas on what more to buy for the bong, write them down!
You know, a quick email to GC customer support (where all that stuff is) will match the right downstem to the right bong. That would be WAY easier than relying on us stoners here to guess....
It looks to be 3'5 inches and that ehle downstem looks like 4". Cannot tell for sure, it would suck if you had to get a new one because the nice one doesn't fit