Last night I mounted the anti- vibration bars.
I have the factory Yamaha winglets.
The factory mounting holes in the winglets have to be enlarged slightly to fit the supplied bolts in the kit - I did this with a round file and 10 sec on each hole was enough to enlarge it for the bolts. - you don't have to drill them out - you are probably enlarging the holes 0.5mm.
Ok so the supplied bolt is 1/4 dia - 20UNC, 3/4in long (19mm) do work with the Yamaha winglets - but only just. You have to put pressure on the bolt and push the bolt in to get the nut on, then tighten them up quite a bit - not ideal - but it did survive today's ride.
It would be much better if the bolts were 5-6mm longer at 1in/25mm. as it stands the bolts do not engage the nyloc part of the nyloc nuts if you add the winglets.
If you want to add a rubber spacer between the arm and the winglet, or extra washers you will need to add that thickness as well.
I will be going out and buying longer bolts to fix this, as I dont want vibration working the bolts loose - and LocTite is a nono as you have to take the winglets off to lift the tank to undo some of the bolts on LHS or get the RHS top faring part off.