The stock boots can be cut to fit: http://www.duncanracing.com/techfaq/Instal...a-banshee.phtml
You might also run into the fact that the left carb rubs on the clutch lever. You can either grind down a bit on the bottom drain bolt on the bowl, it can then still be removed for easy main jet access. Some people weld the hole shut...wouldn't do that. Or you can get the spacers to move the carbs back a bit.