Is it similar to an 0-ring port, with metric threads?
I haven't seen it personally. From his description, I made him two "caps" from M14x1.5 nuts with a 3/32" slice of round stock welded to the end. I then punched out an 1/8" thick round piece of vulcanized rubber to fit down inside of the "cap" to create the seal.
So what your saying is, he needs a M14x1.5 plug (or a bolt) with an o-ring for the rack.
If this is the case, Ryan, you'll now owe me two (2) 6ers of Burning River... And I want to see the fitting on the rack first. /ubbthreads/images/graemlins/banghead.gif