my glass-holes overflow box is installed on the build, but ya know i'm not gonna be using it anytime soon LOL
if ya can't come up w/ one, we can always take mine out & you get me a replacement from glass-holes. it's the 1.5" short....i had a few extra 1.5 longs but sold 'em. i also have a few extra 1.5" mpt/slip elbows if ya need some (think i have 3)
might also see if you can get in touch w/ gsusfreak (John i think LOL).....he got my 50g tank & all the bulkheads for the holes i drilled. think he was gonna set it up as a frog tank eventually, but not sure if he got around to doing that