freeze, all the R1's and R6's and YZF600 and even the kawasaki ninjas and cbrs i believe ALL use that very same throttle housing.
Im using one that came off a 04-06 R1 and im using 04-06 R1 cables which i had to modify LOL not fun.
So if the YZF600 cables are right length then PLEASE let me know! those cable will work in your r6 throttle housing as well just to let you know...and they will fit an any of the above listed bikes there.
im pretty sure mine had that little nub though, i know the controls did but that was fine because I have the clip-on to match the controls, bike I believe that I moved the throttle housing around to find its best positioning but I dont remember grinding the nub down...ill go check.
and are you guys cutting and soldering your cables??? because if you are STOP!
You can simply stick a tiny tiny (ones used for screws on eye glasses) into the wire connecter and push down on the clip that hold the wire in and simply pull it out and stick it into the FZR connecter in the right order with NO cutting or soldering or any of that!
if you have good eyes, youll be able to look into the from of your connecter and see the little tabs sticking up that hold them in place.
*attached: Picture of wires removed from connecter reading to put into FZR connecter
if I remember correctly though, I think my right side controls had different sized connecter things attached to the wires so I was unable to do this with them.