I picked up a nv4500 for a great price but the guy kept the square to top cover and trans came with a early style with the intergrated shifter stub, my question is can the internals out of the top be swaped in to a square top

Should be able to trade covers. Just double check for bolt pattern and the shift forks layout the same.

Well i know the full coveres will but can ibtake the rails and forks outbof the old style top and put in a new style