Make sure to do as Ryan said and count the head bolts. Other kohlers had 13 fins, K321 (14 horse), K301 (12 horse), etc had 13 fins. The 169 would of had headlights from the factory, but they are easy to find. Muffler, hard to find. Still a low production cub. What kind of shape is your Original and 126 in? Got pics of all three? Would be easier to give an idea of good trade versus ok trade.
Good luck and keep us posted.