Ah OK. Found this thread then:
http://canreef.com/vbulletin/showthread.php?t=23508
Unfortunately the pics are no longer up. But at least I can tell that it's a 1.5" bulkhead so you don't have to check into that one anymore (thanks anyhow though).
Are you keeping the stand and durso standpipe, or did you not end up buying those yourself?