Any time I need anything for my fixed gear the one place I go is Harris Cyclery in West Newton, MA. This is the shop affiliated with the legendary (in the fixie world at least) Sheldon Brown. They have almost every imaginable fixie part, and they know everything about fixed gear bikes. Call them up and try to explain what you need, and I guarantee that they either have it, or they will know exactly where to get it. Good luck.
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