Do you mean the Happs "heavy duty trigger stick?" It will work, but it's an 8-way restrictor. You pretty much have to find an original, or convince one of our fabricating friends to make a new one to get a real TRON restrictor.
He asked about the grommet.
I
KNOW that the grommets will swap between the Tron, Discs of Tron, and Xenophobe sticks.
I'm not sure about the Happ ones though because I don't have one of those to the best of my knowledge.
I
THINK they are the same as the Xenophobe sticks, except that they use microswitches in place of the leafswitches, but I can't swear to it.