While the genuine IH kit is the only way to go on a Cub carb, I was disappointed with the IH kit for a Zenith on a 100. I would go to NAPA, I used their kit on my Super A an it worked well. It does not include the throttle shaft, so if you need that, it will have to came from Case/IH. You need the number off the round brass tag on the top of the carburetor to be sure you get the correct kit. I believe the NAPA number is CRB 21565 for most IH Zenith carbs used on the Super A.