RYAN G. - The sponsors who sell used parts can make sure You get a CC-Spec engine. Kohler made engines for green, several shades of orange, and some blue, and yellow tractors and many other applications and the crankshafts & oil pans all varied. Cub Cadet was consistent in their mounting footprint at least so a CC 10 thru 16 HP pan will bolt in place of a 7 HP pan and space the crankshaft centerline correctly in the verticle & horizontal plane, and all the crankshafts are 1" dia. and the right length. The CC specific parts will bolt up to the other blocks but there's no telling if they'll actually work.