I bought a fat bike frame and some parts off Ebay a while back and the Freehub body is broken on the rear wheel. It seems to turn fine but suddenly stiffens up. Bike is a Genesis Caribou (the green one). Wheels are the stock ones that came with the bike. Can I get just the freehub body? Any ideas which one I need? I really don't want to get a new rear hub if I can help it.