Ya, I thought the same and bought them - not longer. Since I had to use it, I used a 3/16" spacer (06.2170) behind each of the bottom rear air filter mounting bolts, and two instead of one for the top bracket. That made the carb side of the air cleaner as far away from the carbs as a 2-1/6" filter would make it. The boots work fine then. The carb-end of the boots has a slot just inside. You screw the carb adapter sleeves (03.3027) on "backwards" and their flange goes in the slot - the boots are very stable.