They are definitely the thickest option. And with three spares, you can help out the next guy who asks, and maybe make a new friend.The standard fix for this is a 4 pack of 1" black crutch tips sold at Walmart for $3. You'll have 3 spares that way. Not as hillbilly as it sounds.
The stub is actually the emissions air pump intake...they started showing up on air cleaners about 68 or so. I plugged mine with a tubing cap....not even sure where I found it....but it fits LOL.how about just hooking that up to the valve cover, like it should be, there should be a hose going from the valve cover to the air cleaner. the barb on the valve cover is right below it