So I was a little confused on the last bit you just posted up. Is it not possible to buy the R556 brakes and just use the longer bolt from my older brake set, seeing as it's already cut to the proper lenght for my frame? And if the answer's no, is there any way to simply buy that bolt somewhere where I am not spending 18 bucks on it and ending up with a set of brakes I'll probably never use?

...Thanks for the post up by the way, I'm doing my first single speed conversion from an old schwinn worldsport frame I have and this problem didn't even occur to me untill I caught your thread. Thanks for the heads up.