Good Morning - I have had the good fortune to pick up a really nice 2007 Look 595 to add to my choices of things to ride (N+1). The bike is in beautiful shape. Every component on it is in like new condition. The only thing I want to change is the FSA cranks. They are FSA K-Force carbon cranks. BB is FSA MegaExo. BB is english threaded. I have a perfectly good nearly brand new Shimano Ultegra FC-6800 crankset I'd like to install. Question is do I need to replace the BB. I don't have one on hand so I'd have to order it. Thanks for your input!