As Brian said, the clips are cheap. They're available at subaruparts.com. Just to to the engine diagram.
The H-6 cover has to come off to get to the hoses. You COULD just undo the hoses, but there are smaller hoses restricting the movement of the "two big hoses." It's much easier to get the can of cleaner behind the butterflies if you remove the stuff. You'll see what I mean, once you try.