good advice. never install any o-ring without lubejust as a note - i found that either t will leak a tiny bit if put in dry until the fuel causes them to swell and seat. I solved that by putting a bit of grease on the rings before installation. Which made them easier to put in too. Ymmv.
I'm using that brass one from mikes. It leaked when I first put it on, so i went to the hardware store and got some more rubber gaskets. Doubled them up and it tightened right up. No problems so far.
How did you end up running the brass T with those seals that are too big for anything?