See attached distribution block for spraybar that I made and used. This style was meant to be inserted into existing dry nozzlt holes (after drilling out to 3/8" diameter) and held in place with a 3/8-24 nut on the outside of the airbox. The nitrous jst goes into the end of the block and a -3 line is attached, the same as with a dry nozzle. 4 lengths of 1/8" OD plastic line are inserted into the fittings and the other ends are inserted into small holes in the TB Stacks.
May not be the best solution available, but seems to work just finr and only requires a piece of 1/2" square stock, 1.375" long to make.
John