jammme, make sure of the dimensions hole center to hole center,, and the results will differ from bike to bike, i can only tell you what i have discovered on the -S- i have and the Cup i have been making the measurements on at A&S, dont be afriad to caparo pieces, get down on the rub with all those bikes on display, do your own research and you will know what your doing, this is not the norm for these parts guys.
Todd is a good fellow, but i do the measurements for him, he is not overly technical, make sure of what your doing and the results to expect.
You need to know the length now vs. what your going to.
The other bikes will differ in the way they respond also, still at arounf 60-80 bucks well worth trying and see hoe you like it.