So i have been having the damnedest time trying to find some brake levers for my Nitto Promenade B-603 bars, I bought the bars and the brake levers have been sliding all over the place. so i finally realized i need some mountain bike levers.

Well i did find some pyramid brake levers that would fit better. well i bought them, and put them on but i noticed the piece that slides on the brake cable is much smaller than a normal size i believe it is called a Ferrule is this a certain size i ask for, everywhere i go they give me a small sized one but it slides inside the hole and does not sit right.