Specialized Fatboy we found a few months ago. I have no idea on the wheels cranks or other parts it may need, and ideas?

You have the correct stem. I am not sure what wheels or cranks came on them. I know Specialized did have some cromo 3 piece cranks at one time. The bars I had were 4 piece and looked like old school boss bars minus the middle bar. They are neat frames and make interesting noises when rocks hit them while riding. I would just build it up to be rideable. Does it have the steel clip inserts for the rear dropouts?

cool looking frame