hello I have a wellcraft 21ft 1987 with no outboard motor and the transom on the back is 25 inches long I don't know if I would by long shaft or short shaft whats the diference I know a long shaft will fit but Im geting a good deal on a Evinrude outboard 200hp vro but the problem is tha is short shaft 20 inches,somebody could help me to know if short shaft would be good thank for any help or please write at solomax7@aol.com